I'm passionate about all geographical events and am a keen blogger. The upper surface is uneven and corrugated. They have a type of algae called Hard coral make up the skeleton of the reef. Coral, any of a variety of invertebrate marine organisms of the class Anthozoa that are characterized by skeletons—external or internal—of a stonelike, horny, or leathery consistency. An atoll is a type of coral reef with a coral rim that partially or completely surrounds a water body known as a lagoon. Features of Coral reefs. The last glacial period marked the formation of coral reefs when melting ice caused the sea levels to rise and flood the continental plates. Since they live in the intertidal zone their environments which they live in is constantly change. Their hard outer skeletons (exoskeletons) are what make up coral reefs. An atoll is a ring-shaped coral reef, island, or series of islets.An atoll surrounds a body of water called a lagoon.Sometimes, atolls and lagoons protect a central island. See more. This limestone is why these corals are called stony corals. Polyps live on … Definition of Coral Reef: Vaughan (1917) has defined coral reef as “a ridge or mound of lime stone, the upper surface of which is near the … Coral Reefs And Atoll For IAS Exam, ( Geography optional ) syllabus. As the volcano continues to erupt, the seamount's elevation … Article Shared by .

Coral polyps are tiny, soft-bodied organisms related to sea anemones and jellyfish. Definition of Coral Reef 2. Often called the “rainforests of the sea,” coral reefs are home to a A coral reef may grow into a permanent coral island. 5. At first glance, you may think that coral reefs are made up of rocks, but they are actually live organisms. It lives in 'brackish' water. Often called the “rainforests of the sea,” coral reefs are home to a 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.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 jellyfish. What is … Coral reefs are one of the most important ecosystems in the world, and have been called 'the rainforests of the sea' owing to the diverse range of plants and animals that they support. Hence, these are supposed to be the principal builders of coral reefs though there are certain other contributors also. A coral reef, in fact, is a ridge of lime stone whose upper surface is just below the sea surface and it is exposed at low tides.