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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.
The first three chapters describe the various types of coral reef, each chapter starting with a section giving a detailed description of the reef Darwin had most information about, which he presents as a typical example of the type. Subsequent sections in each chapter then describe other reefs in comparison with the typical example.
Crescentic reefs are also found in the far north of the Great Barrier Reef Marine Park, and in the Swain Reefs (20–22 degrees south). Planar reefs are found in the northern and southern parts, near Cape York Peninsula, Princess Charlotte Bay, and Cairns. Most of the islands on the reef are found on planar reefs. [30]: 158–160
Corals and coral reefs are endangered due to global warming, which results in coral bleaching. According to UNESCO, the coral reefs in all 29 reef-containing World Heritage sites would cease to ...
Set off the coast of Sablayan in the Philippines, Apo Reef Natural Park spans 13 square miles. This protected aquatic wonderland teems with marine life, including 530 fish species and 400 types of ...
The densest and most spectacular reefs, along with the highest water clarity, are found to the seaward of Key Largo (in and beyond John Pennekamp Coral Reef State Park) and Elliott Key (the northernmost 'true' Florida Key) where the two long keys help protect the reefs from the effects of water exchange with Florida Bay, Biscayne Bay, Card ...
The world’s largest deep-sea coral reef has been discovered off the East Coast: a massive 6.4 million acre seascape that stretches from Florida to South Carolina, according to National Oceanic ...
Aerial view of Ningaloo Reef in Western Australia, the largest fringing coral reef in the world and a UNESCO World Heritage Site. Fringing reefs are located near shore in the tropics in many areas and are the most common reef type. Coral reefs are found in the tropics in which the water is between 18 and 30 °C (64 and 86 °F). [6]