Books > Earth & environment > Earth sciences > The hydrosphere > Oceanography (seas)
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Life and Death of Coral Reefs (Paperback, Softcover reprint of the original 1st ed. 1997)
Loot Price: R8,557
Discovery Miles 85 570
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Life and Death of Coral Reefs (Paperback, Softcover reprint of the original 1st ed. 1997)
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Charles Birkeland Living coral is a thin veneer, measured in
millimeters. Yet this thin film of living tissue has shaped the
face of the Earth by creating limestone structures sometimes over
1,300 m thick from the surface down to its base on volcanic rock
(Enewetak Atoll), or over 2,000 km long (Great Barrier Reef). About
half the world's coastlines are in the tropics and about a third of
the tropical coastlines are made of coral reef. Archipelagoes of
hundreds of atolls such as the Marshalls, the Maldives, the
Tuamotus, and most of the Carolines and Kiribati have been fonned
by coral. In addition to enlarging high islands (such as the entire
northern end of Guam) and extending and protecting coastlines,
ancient biogenic reefs have fonned even larger areas on the present
continents. Shallow living coral 2 reefs are estimated to presently
cover over 600,000 km (Smith, 1978). Coral reefs are dynamic
systems, producing limestone at the rate of 400-2,000 tons per
hectare per year (Chave et aI. , 1972). The Great Barrier Reef
dominates 2 230,000 km and has grown to this size in a geologically
brief period of a few million years. Coral reefs influence the
chemical balance of the world's oceans. Roughly half the calcium
that enters the sea each year around the world, from the north to
south poles, is taken up and temporarily bound into coral reefs
(Smith, 1978).
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