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66-514: The word littoral may be used both as a noun and as an adjective . It derives from the Latin noun litus, litoris , meaning "shore". (The doubled t is a late-medieval innovation, and the word is sometimes seen in the more classical-looking spelling litoral .) The term has no single definition. What is regarded as the full extent of the littoral zone, and the way the littoral zone is divided into subregions, varies in different contexts. For lakes,

132-544: A or an (in languages that have such articles). Examples of count nouns are chair , nose , and occasion . Mass nouns or uncountable ( non-count ) nouns differ from count nouns in precisely that respect: they cannot take plurals or combine with number words or the above type of quantifiers. For example, the forms a furniture and three furnitures are not used – even though pieces of furniture can be counted. The distinction between mass and count nouns does not primarily concern their corresponding referents but more how

198-445: A person , place , thing , event , substance , quality , quantity , etc., but this manner of definition has been criticized as uninformative. Several English nouns lack an intrinsic referent of their own: behalf (as in on behalf of ), dint ( by dint of ), and sake ( for the sake of ). Moreover, other parts of speech may have reference-like properties: the verbs to rain or to mother , or adjectives like red ; and there

264-564: A broad littoral zone to a narrow band of vegetation. Marshes and wet meadows are at particular risk. For the purposes of naval operations, the US Navy divides the littoral zone in the ways shown on the diagram at the top of this article. The US Army Corps of Engineers and the US Environmental Protection Agency have their own definitions, which have legal implications. The UK Ministry of Defence defines

330-455: A continental shelf differs significantly from the geological definition. UNCLOS states that the shelf extends to the limit of the continental margin , but no less than 200 nmi (370 km; 230 mi) and no more than 350 nmi (650 km; 400 mi) from the baseline . Thus inhabited volcanic islands such as the Canaries , which have no actual continental shelf, nonetheless have

396-832: A distance where the depth of waters admitted of resource exploitation were claimed by the marine nations that signed the Convention on the Continental Shelf drawn up by the UN's International Law Commission in 1958. This was partly superseded by the 1982 United Nations Convention on the Law of the Sea (UNCLOS). The 1982 convention created the 200 nautical miles (370 km; 230 mi) exclusive economic zone, plus continental shelf rights for states with physical continental shelves that extend beyond that distance. The legal definition of

462-463: A language. Nouns may be classified according to morphological properties such as which prefixes or suffixes they take, and also their relations in syntax  – how they combine with other words and expressions of various types. Many such classifications are language-specific, given the obvious differences in syntax and morphology. In English for example, it might be noted that nouns are words that can co-occur with definite articles (as stated at

528-516: A lexical category ( part of speech ) defined according to how its members combine with members of other lexical categories. The syntactic occurrence of nouns differs among languages. In English, prototypical nouns are common nouns or proper nouns that can occur with determiners , articles and attributive adjectives , and can function as the head of a noun phrase . According to traditional and popular classification, pronouns are distinct from nouns, but in much modern theory they are considered

594-404: A narrow or broad fringing wetland, with extensive areas of aquatic plants sorted by their tolerance to different water depths. Typically, four zones are recognized, from higher to lower on the shore: wooded wetland, wet meadow , marsh and aquatic vegetation . The relative areas of these four types depends not only on the profile of the shoreline, but upon past water levels. The area of wet meadow

660-417: A narrow, almost homogenous, eulittoral strip, often marked by the presence of barnacles . Exposed sites show a wider extension and are often divided into further zones. For more on this, see intertidal ecology . The sublittoral zone starts immediately below the eulittoral zone. This zone is permanently covered with seawater and is approximately equivalent to the neritic zone . In physical oceanography ,

726-430: A noun being used as the head (main word) of a noun phrase and a noun being used as a noun adjunct . For example, the noun knee can be said to be used substantively in my knee hurts , but attributively in the patient needed knee replacement . A noun can co-occur with an article or an attributive adjective . Verbs and adjectives cannot. In the following, an asterisk (*) in front of an example means that this example

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792-417: A noun that represents a unique entity ( India , Pegasus , Jupiter , Confucius , Pequod ) – as distinguished from common nouns (or appellative nouns ), which describe a class of entities ( country , animal , planet , person , ship ). In Modern English, most proper nouns – unlike most common nouns – are capitalized regardless of context ( Albania , Newton , Pasteur , America ), as are many of

858-424: A number of distinctive characteristics to littoral regions. The erosive power of water results in particular types of landforms , such as sand dunes , and estuaries . The natural movement of the littoral along the coast is called the littoral drift . Biologically, the ready availability of water enables a greater variety of plant and animal life, and particularly the formation of extensive wetlands . In addition,

924-586: A singular or a plural verb and referred to by a singular or plural pronoun, the singular being generally preferred when referring to the body as a unit and the plural often being preferred, especially in British English, when emphasizing the individual members. Examples of acceptable and unacceptable use given by Gowers in Plain Words include: Concrete nouns refer to physical entities that can, in principle at least, be observed by at least one of

990-464: A small fraction of total lake areas. Because the littoral zone is important for many recreational and industrial purposes, it is often severely affected by many human activities that increase nutrient loading, spread invasive species, cause acidification and climate change , and produce increased fluctuations in water level. Littoral zones are both more negatively affected by human activity and less intensively studied than offshore waters. Conservation of

1056-401: A specific sex. The gender of a pronoun must be appropriate for the item referred to: "The girl said the ring was from her new boyfriend , but he denied it was from him " (three nouns; and three gendered pronouns: or four, if this her is counted as a possessive pronoun ). A proper noun (sometimes called a proper name , though the two terms normally have different meanings) is

1122-470: A subclass of nouns parallel to prototypical nouns ). For example, in the sentence "Gareth thought she was weird", the word she is a pronoun that refers to a person just as the noun Gareth does. The word one can replace parts of noun phrases, and it sometimes stands in for a noun. An example is given below: But one can also stand in for larger parts of a noun phrase. For example, in the following example, one can stand in for new car . Nominalization

1188-405: A subclass of nouns. Every language has various linguistic and grammatical distinctions between nouns and verbs . Word classes (parts of speech) were described by Sanskrit grammarians from at least the 5th century BC. In Yāska 's Nirukta , the noun ( nāma ) is one of the four main categories of words defined. The Ancient Greek equivalent was ónoma (ὄνομα), referred to by Plato in

1254-748: Is a phrase usually headed by a common noun, a proper noun, or a pronoun. The head may be the only constituent, or it may be modified by determiners and adjectives . For example, "The dog sat near Ms Curtis and wagged its tail" contains three NPs: the dog (subject of the verbs sat and wagged ); Ms Curtis (complement of the preposition near ); and its tail (object of wagged ). "You became their teacher" contains two NPs: you (subject of became ); and their teacher . Nouns and noun phrases can typically be replaced by pronouns , such as he, it, she, they, which, these , and those , to avoid repetition or explicit identification, or for other reasons (but as noted earlier, current theory often classifies pronouns as

1320-494: Is a process whereby a word that belongs to another part of speech comes to be used as a noun. This can be a way to create new nouns, or to use other words in ways that resemble nouns. In French and Spanish, for example, adjectives frequently act as nouns referring to people who have the characteristics denoted by the adjective. This sometimes happens in English as well, as in the following examples: For definitions of nouns based on

1386-593: Is also minimal, at less than 20 m (66 ft). Though the continental shelf is treated as a physiographic province of the ocean , it is not part of the deep ocean basin proper, but the flooded margins of the continent. Passive continental margins such as most of the Atlantic coasts have wide and shallow shelves, made of thick sedimentary wedges derived from long erosion of a neighboring continent. Active continental margins have narrow, relatively steep shelves, due to frequent earthquakes that move sediment to

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1452-469: Is evidence that changing wind, rainfall, and regional ocean currents in a warming ocean are having an effect on some shelf seas. Improved data collection via Integrated Ocean Observing Systems in shelf sea regions is making identification of these changes possible. Continental shelves teem with life because of the sunlight available in shallow waters, in contrast to the biotic desert of the oceans' abyssal plain . The pelagic (water column) environment of

1518-462: Is known as an insular shelf . The continental margin , between the continental shelf and the abyssal plain , comprises a steep continental slope, surrounded by the flatter continental rise , in which sediment from the continent above cascades down the slope and accumulates as a pile of sediment at the base of the slope. Extending as far as 500 km (310 mi) from the slope, it consists of thick sediments deposited by turbidity currents from

1584-442: Is little difference between the adverb gleefully and the prepositional phrase with glee . A functional approach defines a noun as a word that can be the head of a nominal phrase, i.e., a phrase with referential function, without needing to go through morphological transformation. Nouns can have a number of different properties and are often sub-categorized based on various of these criteria, depending on their occurrence in

1650-457: Is often attracted to shorelines, and settlement often disrupts breeding habitats for littoral zone species. For example, many turtles are killed on roads when they leave the water to lay their eggs in upland sites. Fish can be negatively affected by docks and retaining walls which remove breeding habitat in shallow water. Some shoreline communities even deliberately try to remove wetlands since they may interfere with activities like swimming. Overall,

1716-414: Is often cut with submarine canyons . The physical mechanisms involved in forming these canyons were not well understood until the 1960s. Continental shelves cover an area of about 27 million km (10 million sq mi), equal to about 7% of the surface area of the oceans. The width of the continental shelf varies considerably—it is not uncommon for an area to have virtually no shelf at all, particularly where

1782-493: Is particularly dependent upon past water levels; in general, the area of wet meadows along lakes and rivers increases with natural water level fluctuations. Many of the animals in lakes and rivers are dependent upon the wetlands of littoral zones, since the rooted plants provide habitat and food. Hence, a large and productive littoral zone is considered an important characteristic of a healthy lake or river. Littoral zones are at particular risk for two reasons. First, human settlement

1848-447: Is ungrammatical. Nouns have sometimes been characterized in terms of the grammatical categories by which they may be varied (for example gender , case , and number ). Such definitions tend to be language-specific, since different languages may apply different categories. Nouns are frequently defined, particularly in informal contexts, in terms of their semantic properties (their meanings). Nouns are described as words that refer to

1914-663: The Cratylus dialog , and later listed as one of the eight parts of speech in The Art of Grammar , attributed to Dionysius Thrax (2nd century BC). The term used in Latin grammar was nōmen . All of these terms for "noun" were also words meaning "name". The English word noun is derived from the Latin term, through the Anglo-Norman nom (other forms include nomme , and noun itself). The word classes were defined partly by

1980-537: The Minnesota Department of Natural Resources defines littoral as that portion of the lake that is less than 15 feet in depth. Such fixed-depth definitions often do not accurately represent the true ecological zonation, but are sometimes used because they are simple measurements to make bathymetric maps or when there are no measurements of light penetration. The littoral zone comprises an estimated 78% of Earth's total lake area. The littoral zone may form

2046-473: The pelagic zone often rely heavily on resources from the littoral zone. Littoral areas of ponds and lakes are typically better oxygenated, structurally more complex, and afford more abundant and diverse food resources than do profundal sediments. All these factors lead to a high diversity of insects and very complex trophic interactions. The great lakes of the world represent a global heritage of surface freshwater and aquatic biodiversity. Species lists for 14 of

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2112-441: The senses ( chair , apple , Janet , atom ), as items supposed to exist in the physical world. Abstract nouns , on the other hand, refer to abstract objects : ideas or concepts ( justice , anger , solubility , duration ). Some nouns have both concrete and abstract meanings: art usually refers to something abstract ("Art is important in human culture"), but it can also refer to a concrete item ("I put my daughter's art up on

2178-443: The sex or social gender of the noun's referent, particularly in the case of nouns denoting people (and sometimes animals), though with exceptions (the feminine French noun personne can refer to a male or a female person). In Modern English, even common nouns like hen and princess and proper nouns like Alicia do not have grammatical gender (their femininity has no relevance in syntax), though they denote persons or animals of

2244-484: The shelf break ). The sea floor below the break is the continental slope . Below the slope is the continental rise , which finally merges into the deep ocean floor, the abyssal plain . The continental shelf and the slope are part of the continental margin . The shelf area is commonly subdivided into the inner continental shelf , mid continental shelf , and outer continental shelf , each with their specific geomorphology and marine biology . The character of

2310-567: The Asian mainland. Other familiar bodies of water that overlie continental shelves are the North Sea and the Persian Gulf . The average width of continental shelves is about 80 km (50 mi). The depth of the shelf also varies, but is generally limited to water shallower than 100 m (330 ft). The slope of the shelf is usually quite low, on the order of 0.5°; vertical relief

2376-411: The additional local humidity due to evaporation usually creates a microclimate supporting unique types of organisms. In oceanography and marine biology , the idea of the littoral zone is extended roughly to the edge of the continental shelf . Starting from the shoreline, the littoral zone begins at the spray region just above the high tide mark. From here, it moves to the intertidal region between

2442-759: The adjectives happy and serene ; circulation from the verb circulate ). Illustrating the wide range of possible classifying principles for nouns, the Awa language of Papua New Guinea regiments nouns according to how ownership is assigned: as alienable possession or inalienable possession. An alienably possessed item (a tree, for example) can exist even without a possessor. But inalienably possessed items are necessarily associated with their possessor and are referred to differently, for example with nouns that function as kin terms (meaning "father", etc.), body-part nouns (meaning "shadow", "hair", etc.), or part–whole nouns (meaning "top", "bottom", etc.). A noun phrase (or NP )

2508-567: The coast; sand is limited to shallow, wave-agitated waters, while silt and clays are deposited in quieter, deep water far offshore. These accumulate 15–40 centimetres (5.9–15.7 in) every millennium, much faster than deep-sea pelagic sediments . "Shelf seas" are the ocean waters on the continental shelf. Their motion is controlled by the combined influences of the tides , wind-forcing and brackish water formed from river inflows ( Regions of Freshwater Influence ). These regions can often be biologically highly productive due to mixing caused by

2574-512: The concept of "identity criteria": For more on identity criteria: For the concept that nouns are "prototypically referential": For an attempt to relate the concepts of identity criteria and prototypical referentiality: Continental shelf A continental shelf is a portion of a continent that is submerged under an area of relatively shallow water, known as a shelf sea . Much of these shelves were exposed by drops in sea level during glacial periods . The shelf surrounding an island

2640-420: The continental shelf constitutes the neritic zone , and the benthic (sea floor) province of the shelf is the sublittoral zone . The shelves make up less than 10% of the ocean, and a rough estimate suggests that only about 30% of the continental shelf sea floor receives enough sunlight to allow benthic photosynthesis. Though the shelves are usually fertile, if anoxic conditions prevail during sedimentation,

2706-418: The deep sea. The continental shelves are covered by terrigenous sediments ; that is, those derived from erosion of the continents. However, little of the sediment is from current rivers ; some 60–70% of the sediment on the world's shelves is relict sediment , deposited during the last ice age, when sea level was 100–120 m lower than it is now. Sediments usually become increasingly fine with distance from

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2772-401: The definite article is le for masculine nouns and la for feminine; adjectives and certain verb forms also change (sometimes with the simple addition of -e for feminine). Grammatical gender often correlates with the form of the noun and the inflection pattern it follows; for example, in both Italian and Romanian most nouns ending in  -a are feminine. Gender can also correlate with

2838-433: The deposits may over geologic time become sources for fossil fuels . The continental shelf is the best understood part of the ocean floor, as it is relatively accessible. Most commercial exploitation of the sea, such as extraction of metallic ore, non-metallic ore, and hydrocarbons , takes place on the continental shelf. Sovereign rights over their continental shelves down to a depth of 100 m (330 ft) or to

2904-443: The dictionaries of such languages are demarked by the abbreviation s. or sb. instead of n. , which may be used for proper nouns or neuter nouns instead. In English, some modern authors use the word substantive to refer to a class that includes both nouns (single words) and noun phrases (multiword units that are sometimes called noun equivalents ). It can also be used as a counterpart to attributive when distinguishing between

2970-474: The forms that are derived from them (the common noun in "he's an Albanian "; the adjectival forms in "he's of Albanian heritage" and " Newtonian physics", but not in " pasteurized milk"; the second verb in "they sought to Americanize us"). Count nouns or countable nouns are common nouns that can take a plural , can combine with numerals or counting quantifiers (e.g., one , two , several , every , most ), and can take an indefinite article such as

3036-618: The forward edge of an advancing oceanic plate dives beneath continental crust in an offshore subduction zone such as off the coast of Chile or the west coast of Sumatra . The largest shelf—the Siberian Shelf in the Arctic Ocean —stretches to 1,500 kilometers (930 mi) in width. The South China Sea lies over another extensive area of continental shelf, the Sunda Shelf , which joins Borneo , Sumatra, and Java to

3102-482: The fridge"). A noun might have a literal (concrete) and also a figurative (abstract) meaning: "a brass key " and "the key to success"; "a block in the pipe" and "a mental block ". Similarly, some abstract nouns have developed etymologically by figurative extension from literal roots ( drawback , fraction , holdout , uptake ). Many abstract nouns in English are formed by adding a suffix ( -ness , -ity , -ion ) to adjectives or verbs ( happiness and serenity from

3168-413: The grammatical forms that they take. In Sanskrit, Greek, and Latin, for example, nouns are categorized by gender and inflected for case and number . Because adjectives share these three grammatical categories , adjectives typically were placed in the same class as nouns. Similarly, the Latin term nōmen includes both nouns (substantives) and adjectives, as originally did the English word noun ,

3234-622: The high and low water marks, and then out as far as the edge of the continental shelf . These three subregions are called, in order, the supralittoral zone , the eulittoral zone , and the sublittoral zone . The supralittoral zone (also called the splash , spray or supratidal zone ) is the area above the spring high tide line that is regularly splashed, but not submerged by ocean water. Seawater penetrates these elevated areas only during storms with high tides. Organisms that live here must cope with exposure to fresh water from rain, cold, heat, dryness and predation by land animals and seabirds. At

3300-454: The littoral as those land areas (and their adjacent areas and associated air space) that are susceptible to engagement and influence from the sea . Noun In grammar , a noun is a word that represents a concrete or abstract thing, such as living creatures, places, actions, qualities, states of existence, and ideas. A noun may serve as an object or subject within a phrase, clause, or sentence. In linguistics , nouns constitute

3366-442: The littoral zone is the nearshore habitat where photosynthetically active radiation penetrates to the lake bottom in sufficient quantities to support photosynthesis. The use of the term also varies from one part of the world to another, and between different disciplines. For example, military commanders speak of the littoral in ways that are quite different from the definition used by marine biologists . The adjacency of water gives

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3432-467: The nouns present those entities. Many nouns have both countable and uncountable uses; for example, soda is countable in "give me three sodas", but uncountable in "he likes soda". Collective nouns are nouns that – even when they are treated in their morphology and syntax as singular – refer to groups consisting of more than one individual or entity. Examples include committee , government , and police . In English these nouns may be followed by

3498-417: The presence of human settlement has a demonstrated negative impact upon adjoining wetlands. An equally serious problem is the tendency to stabilize lake or river levels with dams. Dams removed the spring flood, which carries nutrients into littoral zones and reduces the natural fluctuation of water levels upon which many wetland plants and animals depend. Hence, over time, dams can reduce the area of wetland from

3564-482: The remarkable biodiversity and biotic integrity of large lakes will require better integration of littoral zones into our understanding of lake ecosystem functioning and focused efforts to alleviate human impacts along the shoreline. In freshwater situations, the littoral zone is the nearshore habitat where photosynthetically active radiation penetrates to the lake bottom in sufficient quantities to support photosynthesis. Sometimes other definitions are used. For example,

3630-400: The shallower waters and the enhanced current speeds. Despite covering only about 8% of Earth's ocean surface area, shelf seas support 15–20% of global primary productivity . In temperate continental shelf seas, three distinctive oceanographic regimes are found, as a consequence of the interplay between surface heating, lateral buoyancy gradients (due to river inflow), and turbulent mixing by

3696-485: The shelf and slope. The continental rise 's gradient is intermediate between the gradients of the slope and the shelf. Under the United Nations Convention on the Law of the Sea , the name continental shelf was given a legal definition as the stretch of the seabed adjacent to the shores of a particular country to which it belongs. The shelf usually ends at a point of increasing slope (called

3762-428: The shelf changes dramatically at the shelf break, where the continental slope begins. With a few exceptions, the shelf break is located at a remarkably uniform depth of roughly 140 m (460 ft); this is likely a hallmark of past ice ages, when sea level was lower than it is now. The continental slope is much steeper than the shelf; the average angle is 3°, but it can be as low as 1° or as high as 10°. The slope

3828-466: The spring low tide line, which is rarely not inundated. It is alternately exposed and submerged once or twice daily. Organisms living here must be able to withstand the varying conditions of temperature, light, and salinity. Despite this, productivity is high in this zone. The wave action and turbulence of recurring tides shape and reform cliffs, gaps and caves, offering a huge range of habitats for sedentary organisms. Protected rocky shorelines usually show

3894-461: The start of this article), but this could not apply in Russian , which has no definite articles. In some languages common and proper nouns have grammatical gender, typically masculine, feminine, and neuter. The gender of a noun (as well as its number and case, where applicable) will often require agreement in words that modify or are used along with it. In French for example, the singular form of

3960-404: The sublittoral zone refers to coastal regions with significant tidal flows and energy dissipation, including non-linear flows, internal waves , river outflows and oceanic fronts. In practice, this typically extends to the edge of the continental shelf , with depths around 200 meters. In marine biology, the sublittoral zone refers to the areas where sunlight reaches the ocean floor, that is, where

4026-444: The sublittoral zone. Within the sublittoral, marine biologists also identify the following: Shallower regions of the sublittoral zone, extending not far from the shore, are sometimes referred to as the subtidal zone . Many vertebrates (e.g., mammals, waterfowl, reptiles) and invertebrates (insects, etc.) use both the littoral zone as well as the terrestrial ecosystem for food and habitat. Biota that are commonly assumed to reside in

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4092-459: The tides and to a lesser extent the wind. Indian Ocean shelf seas are dominated by major river systems, including the Ganges and Indus rivers. The shelf seas around New Zealand are complicated because the submerged continent of Zealandia creates wide plateaus. Shelf seas around Antarctica and the shores of the Arctic Ocean are influenced by sea ice production and polynya . There

4158-402: The top of this area, patches of dark lichens can appear as crusts on rocks. Some types of periwinkles , Neritidae and detritus feeding Isopoda commonly inhabit the lower supralittoral. The eulittoral zone (also called the midlittoral or mediolittoral zone ) is the intertidal zone , known also as the foreshore . It extends from the spring high tide line, which is rarely inundated, to

4224-424: The two types being distinguished as nouns substantive and nouns adjective (or substantive nouns and adjective nouns , or simply substantives and adjectives ). (The word nominal is now sometimes used to denote a class that includes both nouns and adjectives.) Many European languages use a cognate of the word substantive as the basic term for noun (for example, Spanish sustantivo , "noun"). Nouns in

4290-585: The water is never so deep as to take it out of the photic zone . This results in high primary production and makes the sublittoral zone the location of the majority of sea life. As in physical oceanography, this zone typically extends to the edge of the continental shelf . The benthic zone in the sublittoral is much more stable than in the intertidal zone; temperature, water pressure, and the amount of sunlight remain fairly constant. Sublittoral corals do not have to deal with as much change as intertidal corals. Corals can live in both zones, but they are more common in

4356-416: The world's largest lakes reveal that 15% of the global diversity (the total number of species) of freshwater fishes, 9% of non-insect freshwater invertebrate diversity, and 2% of aquatic insect diversity live in this handful of lakes. The vast majority (more than 93%) of species inhabit the shallow, nearshore littoral zone, and 72% are completely restricted to the littoral zone, even though littoral habitats are

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