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ISLAND (O.E. ieg =isle, +land')

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Originally appearing in Volume V14, Page 874 of the 1911 Encyclopedia Britannica.
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ISLAND (O.E. ieg =isle, +See also:land')  , in See also:physical See also:geography, a See also:term generally definable as a piece of See also:land surrounded by See also:water . Islands may be divided into two See also:main classes, See also:continental and oceanic . The former are such as would result from the submergence of a coastal range, or a coastal highland, until the See also:mountain bases were cut off from the mainland while their summits remained above water . The See also:island may have been formed by the See also:sea cutting through the landward end of a See also:peninsula, or by the eating back of a See also:bay or See also:estuary until a portion of the mainland is detached and becomes surrounded by water . In all cases where the continental islands occur, they are connected with the mainland by a continental shelf, and their structure is essentially that of the mainland . The islands off the See also:west See also:coast of See also:Scotland and the Isles of See also:Man and See also:Wight have this relation to See also:Britain, while Britain and See also:Ireland have a similar relation to the See also:continent of See also:Europe . The See also:north-See also:east coast of See also:Australia furnishes similar examples, but in addition to these in that locality there are true oceanic islands near the mainland, formed by the growth of the See also:Great Barrier See also:coral See also:reef . Oceanic islands are due to various causes . It is a question whether the numberless islands of the See also:Malay See also:Archipelago should be regarded as continental or oceanic, but there is no doubt that the See also:South Sea islands scattered over a portion of the Pacific belong to the oceanic See also:group . The ocean See also:floor is by no means a level See also:plain, but rises and falls in mounds, eminences and basins towards the See also:surface . When this configuration is emphasized in any particular oceanic See also:area, so that a See also:peak rises above the surface, an oceanic island is produced . Submarine volcanic activity may also raise material above sea-level, or the buckling of the ocean-See also:bed by See also:earth movements may have a similar result .

Coral islands (see See also:

ATOLL) are oceanic islands, and are frequently clustered upon plateaux where the sea is of no great See also:depth, or appear singly as the See also:crown of some isolated peak that rises from deep water . Island See also:life contains many features of See also:peculiar See also:interest . The sea forms a barrier to some forms of life but acts as a See also:carrier to other colonizing forms that frequently develop new features in their isolated surroundings where the struggle for existence is greater or less than before . When a sea barrier has existed for a very See also:long See also:time there is a marked difference between the See also:fauna and See also:flora even of adjacent islands . In See also:Bali and See also:Borneo, for example, the flora and fauna are See also:Asiatic, while in See also:Lombok and See also:Celebes they are Australian, though the Bali Straits are very narrow . In See also:Java and See also:Sumatra, though belonging to the same group, there- are marked developments of See also:bird life, the See also:peacock being found in Java and the See also:Argus See also:pheasant in Sumatra, having become too specialized to migrate . The Cocos, Keeling Islands and See also:Christmas Island in the See also:Indian Ocean have been colonized by few See also:animal forms, chiefly sea-birds and See also:insects, while they are clothed with abundant vegetation, the seeds of which have been carried by currents and by other means, but the variety of See also:plants is by no means so great as on the mainland . Island life, therefore, is a sure indication of the origin of the island, which may be one of the remnants of a shattered er dissected continent, or may have arisen independently from the sea and become afterwards colonized by See also:drift . The word " island " is sometimes used for a piece of land cut off by the See also:tide or surrounded by See also:marsh (e.g . Hayling Island) . 1 The O.E. ieg, ig, still appearing in See also:local names, e.g . See also:Anglesey, See also:Battersea, is cognate with Norw. by, Icel. ey, and the first See also:part of Ger .

Eiland, &c.; it is referred to the See also:

original See also:Tent. ahwia, a See also:place in water, ahwa, water, cf . See also:Lat. aqua; the same word is seen in See also:English " eyot," " ait," an islet in a See also:river . The spelling " island," accepted before 1700, is due to a false connexion with ` isle," Fr. fie, Lat. insula .

End of Article: ISLAND (O.E. ieg =isle, +land')
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