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A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. [1] Most coral reefs are built from stony corals, whose polyps cluster in groups. Coral belongs to the class Anthozoa in the animal phylum Cnidaria, which includes sea anemones and ...
Eilat's Coral Beach Nature Reserve and Conservation area ( Hebrew: שמורת טבע חוף האלמוגים) is a nature reserve and national park in the Red Sea, near the city of Eilat in Israel. It covers 1.2 kilometres (0.75 mi) of shore, and is the northernmost shallow water coral reef in the world, and possibly one of the more resilient ...
There are various types of shallow-water coral reef, including fringing reefs, barrier reefs and atolls; most occur in tropical and subtropical seas. They are very slow-growing, adding perhaps one centimetre (0.4 in) in height each year. The Great Barrier Reef is thought to have been laid down about two million years ago.
Reefs were formed by corals living in shallow depths of water. Darwin's theory set out a sequence of coral reef formation around an extinct volcanic island, becoming an atoll as the island and ocean floor subsided. Courtesy of the US Geological Survey. When the Beagle set out in 1831, the formation of coral atolls was a scientific puzzle.
Shallow water. Shallow water marine environment refers to the area between the shore and deeper water, [clarification needed] such as a reef wall or a shelf break. [clarification needed] This environment is characterized by oceanic, geological and biological conditions, as described below. The water in this environment is shallow and clear, [1 ...
Great Barrier Reef. The Great Barrier Reef is the world's largest coral reef system, [1][2] composed of over 2,900 individual reefs [3] and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). [4][5] The reef is located in the Coral Sea, off the coast of Queensland ...
A mesophotic coral reef or mesophotic coral ecosystem (MCE), originally from the Latin word meso (meaning middle) and photic (meaning light), is characterized by the presence of both light-dependent coral and algae, and organisms that can be found in water with low light penetration. Mesophotic coral ecosystems occur at depths beyond those ...
A reef is a ridge or shoal of rock, coral or similar relatively stable material, lying beneath the surface of a natural body of water. [55] Many reefs result from natural, abiotic processes but there are also reefs such as the coral reefs of tropical waters formed by biotic processes dominated by corals and coralline algae.
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