. Elementary physical geography . s arealways made by corals. Where conditions are favorable, corals thrive in a marvel-ous manner (Figs. 79 and 207). They live in an abundancethat is hardly equaled by any of the other marine individual builds a skeleton of carbonate of lime, andthese, combining, form a coral mass, which upon the death ofthe animals, is left behind to enter into the formation of a THE COAST LINE. 341 limestone rock. The corals grow along the coast, forminglarge reefs; and at times they produce reefs at a considerabledistance from the shore, which are then known as


. Elementary physical geography . s arealways made by corals. Where conditions are favorable, corals thrive in a marvel-ous manner (Figs. 79 and 207). They live in an abundancethat is hardly equaled by any of the other marine individual builds a skeleton of carbonate of lime, andthese, combining, form a coral mass, which upon the death ofthe animals, is left behind to enter into the formation of a THE COAST LINE. 341 limestone rock. The corals grow along the coast, forminglarge reefs; and at times they produce reefs at a considerabledistance from the shore, which are then known as barrierreefs. The GreatBarrier Reef of ^Australia ex-tends along thecoast, with someinterruption, fora distance of1000 miles; andat times its dis-tance is 60 milesfrom the shore,being the mostextensive growthof coral in anysingle region inthe world. Its width at the surface is rarely more than one or two miles. At times the coral builds isolated islets, which are often known as keys, and which are so well illustrated by the keys.


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