99-688: Fairhaven Bay is a lake located within the Sudbury river in Concord, Massachusetts , United States (US). It was frequented by Henry David Thoreau who, together with Edward Hoar, accidentally set fire to the woods near the bay in April 1844, as later described in Thoreau's journal. In 1895, George Bradford Bartlett, ”well-known in connection with the Manse boathouse”, wrote of the cliffs near Fairhaven Bay on
198-409: A body of water from 2 hectares (5 acres) to 8 hectares (20 acres). Pioneering animal ecologist Charles Elton regarded lakes as waterbodies of 40 hectares (99 acres) or more. The term lake is also used to describe a feature such as Lake Eyre , which is a dry basin most of the time but may become filled under seasonal conditions of heavy rainfall. In common usage, many lakes bear names ending with
297-500: A comprehensive analysis of the origin of lakes and proposed what is a widely accepted classification of lakes according to their origin. This classification recognizes 11 major lake types that are divided into 76 subtypes. The 11 major lake types are: Tectonic lakes are lakes formed by the deformation and resulting lateral and vertical movements of the Earth's crust. These movements include faulting, tilting, folding, and warping. Some of
396-738: A demonstrative ( þis , þat ), after a possessive pronoun (e.g., hir , our ), or with a name or in a form of address. This derives from the Old English "weak" declension of adjectives. This inflexion continued to be used in writing even after final -e had ceased to be pronounced. In earlier texts, multisyllable adjectives also receive a final -e in these situations, but this occurs less regularly in later Middle English texts. Otherwise, adjectives have no ending and adjectives already ending in -e etymologically receive no ending as well. Earlier texts sometimes inflect adjectives for case as well. Layamon's Brut inflects adjectives for
495-402: A form of organic lake. They form where a buildup of partly decomposed plant material in a wet environment leaves the vegetated surface below the water table for a sustained period of time. They are often low in nutrients and mildly acidic, with bottom waters low in dissolved oxygen. Artificial lakes or anthropogenic lakes are large waterbodies created by human activity . They can be formed by
594-538: A higher perimeter to area ratio than other lake types. These form where sediment from a tributary blocks the main river. These form where sediment from the main river blocks a tributary, usually in the form of a levee . Lakes formed by other processes responsible for floodplain basin creation. During high floods they are flushed with river water. There are four types: 1. Confluent floodplain lake, 2. Contrafluent-confluent floodplain lake, 3. Contrafluent floodplain lake, 4. Profundal floodplain lake. A solution lake
693-510: A hypolimnion; accordingly, very shallow lakes are excluded from this classification system. Based upon their thermal stratification, lakes are classified as either holomictic , with a uniform temperature and density from top to bottom at a given time of year, or meromictic , with layers of water of different temperature and density that do not intermix. The deepest layer of water in a meromictic lake does not contain any dissolved oxygen so there are no living aerobic organisms . Consequently,
792-428: A lake consists of a large area of standing water that occupies an extensive closed depression in limestone, it is also called a karst lake . Smaller solution lakes that consist of a body of standing water in a closed depression within a karst region are known as karst ponds. Limestone caves often contain pools of standing water, which are known as underground lakes . Classic examples of solution lakes are abundant in
891-470: A large number of studies agree that small ponds are much more abundant than large lakes. For example, one widely cited study estimated that Earth has 304 million lakes and ponds, and that 91% of these are 1 hectare (2.5 acres) or less in area. Despite the overwhelming abundance of ponds, almost all of Earth's lake water is found in fewer than 100 large lakes; this is because lake volume scales superlinearly with lake area. Extraterrestrial lakes exist on
990-502: A largely Anglo-Saxon vocabulary (with many Norse borrowings in the northern parts of the country) but a greatly simplified inflectional system. The grammatical relations that were expressed in Old English by the dative and instrumental cases were replaced in Early Middle English with prepositional constructions. The Old English genitive - es survives in the -'s of the modern English possessive , but most of
1089-494: A lengthened – and later also modified – pronunciation of a preceding vowel. For example, in name , originally pronounced as two syllables, the /a/ in the first syllable (originally an open syllable) lengthened, the final weak vowel was later dropped, and the remaining long vowel was modified in the Great Vowel Shift (for these sound changes, see Phonology , above). The final ⟨e⟩ , now silent, thus became
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#17327725266171188-495: A lesser extent), and, therefore, it cannot be attributed simply to the influence of French-speaking sections of the population: English did, after all, remain the vernacular . It is also argued that Norse immigrants to England had a great impact on the loss of inflectional endings in Middle English. One argument is that, although Norse and English speakers were somewhat comprehensible to each other due to similar morphology,
1287-489: A natural outflow and lose water solely by evaporation or underground seepage, or both. These are termed endorheic lakes. Many lakes are artificial and are constructed for hydroelectric power generation, aesthetic purposes, recreational purposes, industrial use, agricultural use, or domestic water supply . The number of lakes on Earth is undetermined because most lakes and ponds are very small and do not appear on maps or satellite imagery . Despite this uncertainty,
1386-593: A process called apophony ), as in Modern English. With the discontinuation of the Late West Saxon standard used for the writing of Old English in the period prior to the Norman Conquest, Middle English came to be written in a wide variety of scribal forms, reflecting different regional dialects and orthographic conventions. Later in the Middle English period, however, and particularly with
1485-403: A result of meandering. The slow-moving river forms a sinuous shape as the outer side of bends are eroded away more rapidly than the inner side. Eventually a horseshoe bend is formed and the river cuts through the narrow neck. This new passage then forms the main passage for the river and the ends of the bend become silted up, thus forming a bow-shaped lake. Their crescent shape gives oxbow lakes
1584-535: A result of the 1959 Hebgen Lake earthquake . Most landslide lakes disappear in the first few months after formation, but a landslide dam can burst suddenly at a later stage and threaten the population downstream when the lake water drains out. In 1911, an earthquake triggered a landslide that blocked a deep valley in the Pamir Mountains region of Tajikistan , forming the Sarez Lake . The Usoi Dam at
1683-524: A variant of the Northumbrian dialect (prevalent in northern England and spoken in southeast Scotland ). During the Middle English period, many Old English grammatical features either became simplified or disappeared altogether. Noun, adjective, and verb inflections were simplified by the reduction (and eventual elimination) of most grammatical case distinctions. Middle English also saw considerable adoption of Anglo-Norman vocabulary, especially in
1782-422: A variation in density because of thermal gradients. Stratification can also result from a density variation caused by gradients in salinity. In this case, the hypolimnion and epilimnion are separated not by a thermocline but by a halocline , which is sometimes referred to as a chemocline . Lakes are informally classified and named according to the seasonal variation in their lake level and volume. Some of
1881-443: Is sag ponds . Volcanic lakes are lakes that occupy either local depressions, e.g. craters and maars , or larger basins, e.g. calderas , created by volcanism . Crater lakes are formed in volcanic craters and calderas, which fill up with precipitation more rapidly than they empty via either evaporation, groundwater discharge, or a combination of both. Sometimes the latter are called caldera lakes, although often no distinction
1980-403: Is a lake occupying a basin formed by surface dissolution of bedrock. In areas underlain by soluble bedrock, its solution by precipitation and percolating water commonly produce cavities. These cavities frequently collapse to form sinkholes that form part of the local karst topography . Where groundwater lies near the grounds surface, a sinkhole will be filled water as a solution lake. If such
2079-468: Is dammed behind an ice shelf that is attached to the coastline. They are mostly found in Antarctica. Fluvial (or riverine) lakes are lakes produced by running water. These lakes include plunge pool lakes , fluviatile dams and meander lakes. The most common type of fluvial lake is a crescent-shaped lake called an oxbow lake due to the distinctive curved shape. They can form in river valleys as
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#17327725266172178-452: Is made. An example is Crater Lake in Oregon , in the caldera of Mount Mazama . The caldera was created in a massive volcanic eruption that led to the subsidence of Mount Mazama around 4860 BCE. Other volcanic lakes are created when either rivers or streams are dammed by lava flows or volcanic lahars . The basin which is now Malheur Lake , Oregon was created when a lava flow dammed
2277-433: Is now rare and used only in oxen and as part of a double plural , in children and brethren . Some dialects still have forms such as eyen (for eyes ), shoon (for shoes ), hosen (for hose(s) ), kine (for cows ), and been (for bees ). Grammatical gender survived to a limited extent in early Middle English before being replaced by natural gender in the course of the Middle English period. Grammatical gender
2376-429: Is unknown but is estimated to be at least 2 million. Finland has 168,000 lakes of 500 square metres (5,400 sq ft) in area, or larger, of which 57,000 are large (10,000 square metres (110,000 sq ft) or larger). Most lakes have at least one natural outflow in the form of a river or stream , which maintain a lake's average level by allowing the drainage of excess water. Some lakes do not have
2475-524: The Augustinian canon Orrm wrote the Ormulum , one of the oldest surviving texts in Middle English. The influence of Old Norse aided the development of English from a synthetic language with relatively free word order to a more analytic language with a stricter word order. Both Old English and Old Norse were synthetic languages with complicated inflections. Communication between Vikings in
2574-597: The Danelaw and their Anglo-Saxon neighbours resulted in the erosion of inflection in both languages. Old Norse may have had a more profound impact on Middle and Modern English development than any other language. The effect of Old Norse on Old English was substantive, pervasive, and of a democratic character. Like close cousins, Old Norse and Old English resembled each other, and with some words and grammatical structures in common, speakers of each language roughly understood each other, but according to historian Simeon Potler
2673-616: The Early Modern English and Modern English eras. Middle English generally did not have silent letters . For example, knight was pronounced [ˈkniçt] (with both the ⟨k⟩ and the ⟨gh⟩ pronounced, the latter sounding as the ⟨ch⟩ in German Knecht ). The major exception was the silent ⟨e⟩ – originally pronounced but lost in normal speech by Chaucer's time. This letter, however, came to indicate
2772-759: The Malheur River . Among all lake types, volcanic crater lakes most closely approximate a circular shape. Glacial lakes are lakes created by the direct action of glaciers and continental ice sheets. A wide variety of glacial processes create enclosed basins. As a result, there are a wide variety of different types of glacial lakes and it is often difficult to define clear-cut distinctions between different types of glacial lakes and lakes influenced by other activities. The general types of glacial lakes that have been recognized are lakes in direct contact with ice, glacially carved rock basins and depressions, morainic and outwash lakes, and glacial drift basins. Glacial lakes are
2871-649: The Norman Conquest , had normally been written in French. Like Chaucer's work, this new standard was based on the East Midlands-influenced speech of London. Clerks using this standard were usually familiar with French and Latin , influencing the forms they chose. The Chancery Standard, which was adopted slowly, was used in England by bureaucrats for most official purposes, excluding those of
2970-554: The Proto-Indo-European root * leǵ- ('to leak, drain'). Cognates include Dutch laak ('lake, pond, ditch'), Middle Low German lāke ('water pooled in a riverbed, puddle') as in: de:Wolfslake , de:Butterlake , German Lache ('pool, puddle'), and Icelandic lækur ('slow flowing stream'). Also related are the English words leak and leach . There is considerable uncertainty about defining
3069-399: The density of water varies with temperature, with a maximum at +4 degrees Celsius, thermal stratification is an important physical characteristic of a lake that controls the fauna and flora , sedimentation, chemistry, and other aspects of individual lakes. First, the colder, denser water typically forms a layer near the bottom, which is called the hypolimnion . Second, normally overlying
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3168-605: The ocean , although they may be connected with the ocean by rivers . Lakes, as with other bodies of water , are part of the water cycle , the processes by which water moves around the Earth. Most lakes are freshwater and account for almost all the world's surface freshwater, but some are salt lakes with salinities even higher than that of seawater . Lakes vary significantly in surface area and volume of water. Lakes are typically larger and deeper than ponds , which are also water-filled basins on land, although there are no official definitions or scientific criteria distinguishing
3267-645: The 12th century, incorporating a unique phonetic spelling system; and the Ancrene Wisse and the Katherine Group , religious texts written for anchoresses , apparently in the West Midlands in the early 13th century. The language found in the last two works is sometimes called the AB language . Additional literary sources of the 12th and 13th centuries include Layamon's Brut and The Owl and
3366-422: The 13th century and was replaced by thorn. Thorn mostly fell out of use during the 14th century and was replaced by ⟨th⟩ . Anachronistic usage of the scribal abbreviation [REDACTED] ( þe , "the") has led to the modern mispronunciation of thorn as ⟨ y ⟩ in this context; see ye olde . Wynn, which represented the phoneme /w/ , was replaced by ⟨ w ⟩ during
3465-409: The 13th century. Due to its similarity to the letter ⟨p⟩ , it is mostly represented by ⟨w⟩ in modern editions of Old and Middle English texts even when the manuscript has wynn. Under Norman influence, the continental Carolingian minuscule replaced the insular script that had been used for Old English. However, because of the significant difference in appearance between
3564-527: The 14th century, even after the loss of the majority of the continental possessions of the English monarchy . In the aftermath of the Black Death of the 14th century, there was significant migration into London , of people to the counties of the southeast of England and from the east and central Midlands of England, and a new prestige London dialect began to develop as a result of this clash of
3663-663: The 1540s after the printing and wide distribution of the English Bible and Prayer Book , which made the new standard of English publicly recognizable and lasted until about 1650. The main changes between the Old English sound system and that of Middle English include: The combination of the last three processes listed above led to the spelling conventions associated with silent ⟨e⟩ and doubled consonants (see under Orthography , below). Middle English retains only two distinct noun-ending patterns from
3762-572: The Church and legalities, which used Latin and Law French respectively. The Chancery Standard's influence on later forms of written English is disputed, but it did undoubtedly provide the core around which Early Modern English formed. Early Modern English emerged with the help of William Caxton 's printing press, developed during the 1470s. The press stabilized English through a push towards standardization, led by Chancery Standard enthusiast and writer Richard Pynson . Early Modern English began in
3861-597: The Earth by extraterrestrial objects (either meteorites or asteroids ). Examples of meteorite lakes are Lonar Lake in India, Lake El'gygytgyn in northeast Siberia, and the Pingualuit crater lake in Quebec, Canada. As in the cases of El'gygytgyn and Pingualuit, meteorite lakes can contain unique and scientifically valuable sedimentary deposits associated with long records of paleoclimatic changes. In addition to
3960-602: The Lincoln Conservation land with the Walden Pond State Reservation . 42°25′32″N 71°21′13″W / 42.4255°N 71.3535°W / 42.4255; -71.3535 Lake A lake is an often naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land . Lakes lie completely on land and are separate from
4059-571: The Lusatian Lake District, Germany. In India, Sudarshana Lake is a historical artificial lake located in the semi-arid region of Girnar, Gujarat, originally constructed during the reign of Chandragupta Maurya. See: List of notable artificial lakes in the United States Meteorite lakes, also known as crater lakes (not to be confused with volcanic crater lakes ), are created by catastrophic impacts with
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4158-557: The Nightingale . Some scholars have defined "Early Middle English" as encompassing English texts up to 1350. This longer time frame would extend the corpus to include many Middle English Romances (especially those of the Auchinleck manuscript c. 1330 ). Gradually, the wealthy and the government Anglicised again, although Norman (and subsequently French ) remained the dominant language of literature and law until
4257-591: The Norse speakers' inability to reproduce the ending sounds of English words influenced Middle English's loss of inflectional endings. Important texts for the reconstruction of the evolution of Middle English out of Old English are the Peterborough Chronicle , which continued to be compiled up to 1154; the Ormulum , a biblical commentary probably composed in Lincolnshire in the second half of
4356-544: The Old English -eþ , Midland dialects showing -en from about 1200, and Northern forms using -es in the third person singular as well as the plural. The past tense of weak verbs was formed by adding an -ed(e) , -d(e) , or -t(e) ending. The past-tense forms, without their personal endings, also served as past participles with past-participle prefixes derived from Old English: i- , y- , and sometimes bi- . Strong verbs , by contrast, formed their past tense by changing their stem vowel (e.g., binden became bound ,
4455-713: The Old Norse influence was strongest in the dialects under Danish control that composed the southern part of the Northern England (corresponding to the Scandinavian Kingdom of Jórvík ), the East Midlands and the East of England , words in the spoken language emerged in the 10th and 11th centuries near the transition from Old to Middle English. Influence on the written languages only appeared from
4554-733: The Sudbury River: "For more than a hundred years these cliffs have been a favorite resort for the nature lover, and the climax of many a Sunday walk or autumnal holiday trip, as no better view can be had of the waving tree-tops and gentle river". To the North, the Bay is bordered by Wright Woods, owned by the Concord Land Conservation Trust. The woods, where Thoreau often walked, link the Fairhaven Bay trails and
4653-710: The abundance of Modern English words for the mechanisms of government that are derived from Anglo-Norman, such as court , judge , jury , appeal , and parliament . There are also many Norman-derived terms relating to the chivalric cultures that arose in the 12th century, an era of feudalism , seigneurialism , and crusading . Words were often taken from Latin, usually through French transmission. This gave rise to various synonyms, including kingly (inherited from Old English), royal (from French, inherited from Vulgar Latin), and regal (from French, which borrowed it from Classical Latin). Later French appropriations were derived from standard, rather than Norman, French. Examples of
4752-494: The areas of politics, law, the arts, and religion, as well as poetic and emotive diction. Conventional English vocabulary remained primarily Germanic in its sources, with Old Norse influences becoming more apparent. Significant changes in pronunciation took place, particularly involving long vowels and diphthongs, which in the later Middle English period began to undergo the Great Vowel Shift . Little survives of early Middle English literature , due in part to Norman domination and
4851-866: The base of the valley has remained in place for more than 100 years but the terrain below the lake is in danger of a catastrophic flood if the dam were to fail during a future earthquake. Tal-y-llyn Lake in north Wales is a landslide lake dating back to the last glaciation in Wales some 20000 years ago. Aeolian lakes are produced by wind action . These lakes are found mainly in arid environments, although some aeolian lakes are relict landforms indicative of arid paleoclimates . Aeolian lakes consist of lake basins dammed by wind-blown sand; interdunal lakes that lie between well-oriented sand dunes ; and deflation basins formed by wind action under previously arid paleoenvironments. Moses Lake in Washington , United States,
4950-583: The beginning of the 13th century, this delay in Scandinavian lexical influence in English has been attributed to the lack of written evidence from the areas of Danish control, as the majority of written sources from Old English were produced in the West Saxon dialect spoken in Wessex , the heart of Anglo-Saxon political power at the time. The Norman Conquest of England in 1066 saw the replacement of
5049-414: The clergy for written communication and record-keeping. A significant number of Norman words were borrowed into English and used alongside native Germanic words with similar meanings. Examples of Norman/Germanic pairs in Modern English include pig and pork , calf and veal , wood and forest , and freedom and liberty . The role of Anglo-Norman as the language of government and law can be seen in
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#17327725266175148-507: The comparative and superlative (e.g., greet , great; gretter , greater). Adjectives ending in -ly or -lich formed comparatives either with -lier , -liest or -loker , -lokest . A few adjectives also displayed Germanic umlaut in their comparatives and superlatives, such as long , lenger . Other irregular forms were mostly the same as in modern English. Middle English personal pronouns were mostly developed from those of Old English , with
5247-915: The courses of mature rivers, where a river channel has widened over a basin formed by eroded floodplains and wetlands . Some lakes are found in caverns underground . Some parts of the world have many lakes formed by the chaotic drainage patterns left over from the last ice age . All lakes are temporary over long periods of time , as they will slowly fill in with sediments or spill out of the basin containing them. Artificially controlled lakes are known as reservoirs , and are usually constructed for industrial or agricultural use, for hydroelectric power generation, for supplying domestic drinking water , for ecological or recreational purposes, or for other human activities. The word lake comes from Middle English lake ('lake, pond, waterway'), from Old English lacu ('pond, pool, stream'), from Proto-Germanic * lakō ('pond, ditch, slow moving stream'), from
5346-518: The creation of lakes by the disruption of preexisting drainage networks, it also creates within arid regions endorheic basins that contain salt lakes (also called saline lakes). They form where there is no natural outlet, a high evaporation rate and the drainage surface of the water table has a higher-than-normal salt content. Examples of these salt lakes include Great Salt Lake and the Dead Sea . Another type of tectonic lake caused by faulting
5445-486: The development of the Chancery Standard in the 15th century, orthography became relatively standardised in a form based on the East Midlands-influenced speech of London. Spelling at the time was mostly quite regular . (There was a fairly consistent correspondence between letters and sounds.) The irregularity of present-day English orthography is largely due to pronunciation changes that have taken place over
5544-622: The difference between lakes and ponds , and neither term has an internationally accepted definition across scientific disciplines or political boundaries. For example, limnologists have defined lakes as water bodies that are simply a larger version of a pond, which can have wave action on the shoreline or where wind-induced turbulence plays a major role in mixing the water column. None of these definitions completely excludes ponds and all are difficult to measure. For this reason, simple size-based definitions are increasingly used to separate ponds and lakes. Definitions for lake range in minimum sizes for
5643-495: The different dialects, that was based chiefly on the speech of the East Midlands but also influenced by that of other regions. The writing of this period, however, continues to reflect a variety of regional forms of English. The Ayenbite of Inwyt , a translation of a French confessional prose work, completed in 1340, is written in a Kentish dialect . The best known writer of Middle English, Geoffrey Chaucer , wrote in
5742-531: The double consonant represented a sound that was (or had previously been) geminated (i.e., had genuinely been "doubled" and would thus have regularly blocked the lengthening of the preceding vowel). In other cases, by analogy, the consonant was written double merely to indicate the lack of lengthening. The basic Old English Latin alphabet consisted of 20 standard letters plus four additional letters: ash ⟨æ⟩ , eth ⟨ð⟩ , thorn ⟨þ⟩ , and wynn ⟨ƿ⟩ . There
5841-468: The end of the Middle English period only the strong -'s ending (variously spelled) was in use. Some formerly feminine nouns, as well as some weak nouns, continued to make their genitive forms with -e or no ending (e.g., fole hoves , horses' hooves), and nouns of relationship ending in -er frequently have no genitive ending (e.g., fader bone , "father's bane"). The strong -(e)s plural form has survived into Modern English. The weak -(e)n form
5940-536: The exception of criterion 3, the others have been accepted or elaborated upon by other hydrology publications. The majority of lakes on Earth are freshwater , and most lie in the Northern Hemisphere at higher latitudes . Canada , with a deranged drainage system , has an estimated 31,752 lakes larger than 3 square kilometres (1.2 sq mi) in surface area. The total number of lakes in Canada
6039-418: The exception of the third person plural, a borrowing from Old Norse (the original Old English form clashed with the third person singular and was eventually dropped). Also, the nominative form of the feminine third person singular was replaced by a form of the demonstrative that developed into sche (modern she ), but the alternative heyr remained in some areas for a long time. As with nouns, there
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#17327725266176138-422: The hypolimnion is a transition zone known as the metalimnion . Finally, overlying the metalimnion is a surface layer of warmer water with a lower density, called the epilimnion . This typical stratification sequence can vary widely, depending on the specific lake or the time of year, or a combination of both. The classification of lakes by thermal stratification presupposes lakes with sufficient depth to form
6237-412: The indicator of the longer and changed pronunciation of ⟨a⟩ . In fact, vowels could have this lengthened and modified pronunciation in various positions, particularly before a single consonant letter and another vowel or before certain pairs of consonants. A related convention involved the doubling of consonant letters to show that the preceding vowel was not to be lengthened. In some cases,
6336-907: The intentional damming of rivers and streams, rerouting of water to inundate a previously dry basin , or the deliberate filling of abandoned excavation pits by either precipitation runoff , ground water , or a combination of both. Artificial lakes may be used as storage reservoirs that provide drinking water for nearby settlements , to generate hydroelectricity , for flood management , for supplying agriculture or aquaculture , or to provide an aquatic sanctuary for parks and nature reserves . The Upper Silesian region of southern Poland contains an anthropogenic lake district consisting of more than 4,000 water bodies created by human activity. The diverse origins of these lakes include: reservoirs retained by dams, flooded mines, water bodies formed in subsidence basins and hollows, levee ponds, and residual water bodies following river regulation. Same for
6435-471: The karst regions at the Dalmatian coast of Croatia and within large parts of Florida . A landslide lake is created by the blockage of a river valley by either mudflows , rockslides , or screes . Such lakes are most common in mountainous regions. Although landslide lakes may be large and quite deep, they are typically short-lived. An example of a landslide lake is Quake Lake , which formed as
6534-458: The lake level. Middle English Middle English (abbreviated to ME ) is a form of the English language that was spoken after the Norman Conquest of 1066, until the late 15th century. The English language underwent distinct variations and developments following the Old English period. Scholarly opinion varies, but the University of Valencia states the period when Middle English
6633-657: The largest lakes on Earth are rift lakes occupying rift valleys, e.g. Central African Rift lakes and Lake Baikal . Other well-known tectonic lakes, Caspian Sea , the Sea of Aral , and other lakes from the Pontocaspian occupy basins that have been separated from the sea by the tectonic uplift of the sea floor above the ocean level. Often, the tectonic action of crustal extension has created an alternating series of parallel grabens and horsts that form elongate basins alternating with mountain ranges. Not only does this promote
6732-528: The layers of sediment at the bottom of a meromictic lake remain relatively undisturbed, which allows for the development of lacustrine deposits . In a holomictic lake, the uniformity of temperature and density allows the lake waters to completely mix. Based upon thermal stratification and frequency of turnover, holomictic lakes are divided into amictic lakes , cold monomictic lakes , dimictic lakes , warm monomictic lakes, polymictic lakes , and oligomictic lakes. Lake stratification does not always result from
6831-560: The level of a lake are controlled by the difference between the input and output compared to the total volume of the lake. Significant input sources are precipitation onto the lake, runoff carried by streams and channels from the lake's catchment area, groundwater channels and aquifers, and artificial sources from outside the catchment area. Output sources are evaporation from the lake, surface and groundwater flows, and any extraction of lake water by humans. As climate conditions and human water requirements vary, these will create fluctuations in
6930-561: The main difference lied on their inflectional endings, which led to much confusion within the mixed population that existed in the Danelaw, this endings tended gradually to become obscured and finally lost, "simplifying English grammar" in the process. In time, the inflections melted away and the analytic pattern emerged. Viking influence on Old English is most apparent in pronouns , modals, comparatives, pronominal adverbs (like hence and together ), conjunctions, and prepositions show
7029-481: The mainland; lakes cut off from larger lakes by a bar; or lakes divided by the meeting of two spits. Organic lakes are lakes created by the actions of plants and animals. On the whole they are relatively rare in occurrence and quite small in size. In addition, they typically have ephemeral features relative to the other types of lakes. The basins in which organic lakes occur are associated with beaver dams, coral lakes, or dams formed by vegetation. Peat lakes are
7128-417: The masculine accusative, genitive, and dative, the feminine dative, and the plural genitive. The Owl and the Nightingale adds a final -e to all adjectives not in the nominative, here only inflecting adjectives in the weak declension (as described above). Comparatives and superlatives were usually formed by adding -er and -est . Adjectives with long vowels sometimes shortened these vowels in
7227-424: The mode of origin, lakes have been named and classified according to various other important factors such as thermal stratification , oxygen saturation, seasonal variations in lake volume and water level, salinity of the water mass, relative seasonal permanence, degree of outflow, and so on. The names used by the lay public and in the scientific community for different types of lakes are often informally derived from
7326-485: The moon Titan , which orbits the planet Saturn . The shape of lakes on Titan is very similar to those on Earth. Lakes were formerly present on the surface of Mars, but are now dry lake beds . In 1957, G. Evelyn Hutchinson published a monograph titled A Treatise on Limnology , which is regarded as a landmark discussion and classification of all major lake types, their origin, morphometric characteristics, and distribution. Hutchinson presented in his publication
7425-427: The more complex system of inflection in Old English : Nouns of the weak declension are primarily inherited from Old English n -stem nouns but also from ō -stem, wō -stem, and u -stem nouns, which did not inflect in the same way as n -stem nouns in Old English, but joined the weak declension in Middle English. Nouns of the strong declension are inherited from the other Old English noun stem classes. Some nouns of
7524-415: The morphology of the lakes' physical characteristics or other factors. Also, different cultures and regions of the world have their own popular nomenclature. One important method of lake classification is on the basis of thermal stratification, which has a major influence on the animal and plant life inhabiting a lake, and the fate and distribution of dissolved and suspended material in the lake. For example,
7623-490: The most marked Danish influence. The best evidence of Scandinavian influence appears in extensive word borrowings; however, texts from the period in Scandinavia and Northern England do not provide certain evidence of an influence on syntax. However, at least one scholarly study of this influence shows that Old English may have been replaced entirely by Norse, by virtue of the change from Old English to Norse syntax. While
7722-406: The most numerous lakes in the world. Most lakes in northern Europe and North America have been either influenced or created by the latest, but not last, glaciation, to have covered the region. Glacial lakes include proglacial lakes , subglacial lakes , finger lakes , and epishelf lakes. Epishelf lakes are highly stratified lakes in which a layer of freshwater, derived from ice and snow melt,
7821-551: The most part, being improvised. By the end of the period (about 1470), and aided by the invention of the printing press by Johannes Gutenberg in 1439, a standard based on the London dialects (Chancery Standard) had become established. This largely formed the basis for Modern English spelling, although pronunciation has changed considerably since that time. Middle English was succeeded in England by Early Modern English , which lasted until about 1650. Scots developed concurrently from
7920-791: The names include: Lakes may be informally classified and named according to the general chemistry of their water mass. Using this classification method, the lake types include: A paleolake (also palaeolake ) is a lake that existed in the past when hydrological conditions were different. Quaternary paleolakes can often be identified on the basis of relict lacustrine landforms, such as relict lake plains and coastal landforms that form recognizable relict shorelines called paleoshorelines . Paleolakes can also be recognized by characteristic sedimentary deposits that accumulated in them and any fossils that might be contained in these sediments. The paleoshorelines and sedimentary deposits of paleolakes provide evidence for prehistoric hydrological changes during
8019-693: The old insular g and the Carolingian g (modern g ), the former continued in use as a separate letter, known as yogh , written ⟨ȝ⟩ . This was adopted for use to represent a variety of sounds: [ɣ], [j], [dʒ], [x], [ç] , while the Carolingian g was normally used for [g]. Instances of yogh were eventually replaced by ⟨j⟩ or ⟨y⟩ and by ⟨gh⟩ in words like night and laugh . In Middle Scots , yogh became indistinguishable from cursive z , and printers tended to use ⟨z⟩ when yogh
8118-562: The organic-rich deposits of pre-Quaternary paleolakes are important either for the thick deposits of oil shale and shale gas contained in them, or as source rocks of petroleum and natural gas . Although of significantly less economic importance, strata deposited along the shore of paleolakes sometimes contain coal seams . Lakes have numerous features in addition to lake type, such as drainage basin (also known as catchment area), inflow and outflow, nutrient content, dissolved oxygen , pollutants , pH , and sedimentation . Changes in
8217-423: The other case endings disappeared in the Early Middle English period, including most of the roughly one dozen forms of the definite article ("the"). The dual personal pronouns (denoting exactly two) also disappeared from English during this period. The loss of case endings was part of a general trend from inflections to fixed word order that also occurred in other Germanic languages (though more slowly and to
8316-403: The prestige that came with writing in French rather than English. During the 14th century, a new style of literature emerged with the works of writers including John Wycliffe and Geoffrey Chaucer , whose Canterbury Tales remains the most studied and read work of the period. The transition from Late Old English to Early Middle English had taken place by the 1150s to 1180s, the period when
8415-569: The resulting doublet pairs include warden (from Norman) and guardian (from later French; both share a common ancestor loaned from Germanic). The end of Anglo-Saxon rule did not result in immediate changes to the language. The general population would have spoken the same dialects as they had before the Conquest. Once the writing of Old English came to an end, Middle English had no standard language, only dialects that evolved individually from Old English. Early Middle English (1150–1350) has
8514-807: The second half of the 14th century in the emerging London dialect, although he also portrays some of his characters as speaking in northern dialects, as in " The Reeve's Tale ". In the English-speaking areas of lowland Scotland , an independent standard was developing, based on the Northumbrian dialect . This would develop into what came to be known as the Scots language . A large number of terms for abstract concepts were adopted directly from scholastic philosophical Latin (rather than via French). Examples are "absolute", "act", "demonstration", and "probable". The Chancery Standard of written English emerged c. 1430 in official documents that, since
8613-458: The second person singular in -(e)st (e.g., þou spekest , "thou speakest"), and the third person singular in -eþ (e.g., he comeþ , "he cometh/he comes"). ( þ (the letter "thorn") is pronounced like the unvoiced th in "think", but under certain circumstances, it may be like the voiced th in "that"). The following table illustrates a typical conjugation pattern: Plural forms vary strongly by dialect, with Southern dialects preserving
8712-409: The strong type have an -e in the nominative/accusative singular, like the weak declension, but otherwise strong endings. Often, these are the same nouns that had an -e in the nominative/accusative singular of Old English (they, in turn, were inherited from Proto-Germanic ja -stem and i -stem nouns). The distinct dative case was lost in early Middle English, and although the genitive survived, by
8811-404: The thermal stratification, as well as the degree and frequency of mixing, has a strong control over the distribution of oxygen within the lake. Professor F.-A. Forel , also referred to as the "Father of limnology", was the first scientist to classify lakes according to their thermal stratification. His system of classification was later modified and improved upon by Hutchinson and Löffler. As
8910-456: The times that they existed. There are two types of paleolake: Paleolakes are of scientific and economic importance. For example, Quaternary paleolakes in semidesert basins are important for two reasons: they played an extremely significant, if transient, role in shaping the floors and piedmonts of many basins; and their sediments contain enormous quantities of geologic and paleontologic information concerning past environments. In addition,
9009-440: The top levels of the English-speaking political and ecclesiastical hierarchies by Norman rulers who spoke a dialect of Old French , now known as Old Norman , which developed in England into Anglo-Norman . The use of Norman as the preferred language of literature and polite discourse fundamentally altered the role of Old English in education and administration, even though many Normans of this period were illiterate and depended on
9108-641: The two. Lakes are also distinct from lagoons , which are generally shallow tidal pools dammed by sandbars or other material at coastal regions of oceans or large lakes. Most lakes are fed by springs , and both fed and drained by creeks and rivers , but some lakes are endorheic without any outflow, while volcanic lakes are filled directly by precipitation runoffs and do not have any inflow streams. Natural lakes are generally found in mountainous areas (i.e. alpine lakes ), dormant volcanic craters , rift zones and areas with ongoing glaciation . Other lakes are found in depressed landforms or along
9207-467: The word pond , and a lesser number of names ending with lake are, in quasi-technical fact, ponds. One textbook illustrates this point with the following: "In Newfoundland, for example, almost every lake is called a pond, whereas in Wisconsin, almost every pond is called a lake." One hydrology book proposes to define the term "lake" as a body of water with the following five characteristics: With
9306-425: Was indicated by agreement of articles and pronouns (e.g., þo ule "the feminine owl") or using the pronoun he to refer to masculine nouns such as helm ("helmet"), or phrases such as scaft stærcne (strong shaft), with the masculine accusative adjective ending -ne . Single-syllable adjectives added -e when modifying a noun in the plural and when used after the definite article ( þe ), after
9405-520: Was not yet a distinct j , v , or w , and Old English scribes did not generally use k , q , or z . Ash was no longer required in Middle English, as the Old English vowel /æ/ that it represented had merged into /a/ . The symbol nonetheless came to be used as a ligature for the digraph ⟨ae⟩ in many words of Greek or Latin origin, as did ⟨œ⟩ for ⟨oe⟩ . Eth and thorn both represented /θ/ or its allophone / ð / in Old English. Eth fell out of use during
9504-617: Was originally a shallow natural lake and an example of a lake basin dammed by wind-blown sand. China's Badain Jaran Desert is a unique landscape of megadunes and elongated interdunal aeolian lakes, particularly concentrated in the southeastern margin of the desert. Shoreline lakes are generally lakes created by blockage of estuaries or by the uneven accretion of beach ridges by longshore and other currents. They include maritime coastal lakes, ordinarily in drowned estuaries; lakes enclosed by two tombolos or spits connecting an island to
9603-417: Was ousted by it in most dialects by the 15th. The following table shows some of the various Middle English pronouns. Many other variations are noted in Middle English sources because of differences in spellings and pronunciations at different times and in different dialects. As a general rule, the indicative first person singular of verbs in the present tense ended in -e (e.g., ich here , "I hear"),
9702-475: Was some inflectional simplification (the distinct Old English dual forms were lost), but pronouns, unlike nouns, retained distinct nominative and accusative forms. Third person pronouns also retained a distinction between accusative and dative forms, but that was gradually lost: The masculine hine was replaced by him south of the River Thames by the early 14th century, and the neuter dative him
9801-593: Was spoken as being from 1150 to 1500. This stage of the development of the English language roughly coincided with the High and Late Middle Ages . Middle English saw significant changes to its vocabulary, grammar, pronunciation, and orthography . Writing conventions during the Middle English period varied widely. Examples of writing from this period that have survived show extensive regional variation. The more standardized Old English literary variety broke down and writing in English became fragmented and localized and was, for
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