How Are Corals And Coral Reefs Formed?


3 Answers

Anonymous Profile
Anonymous answered
Basically there are two kinds of marine organisms that form coral reefs. These are algae and polyps.Algae are plants that take water and minerals directly into their cells from the water. They need sunlight to survive and are thus found in tropical waters. They form lime coatings on the rocks of coral reefs that help polyps to make calcium carbonate to form shells and skeletons.

One variety of algae, red algae, produces a scarlet crust even at depths of 70 meters. A polyp is a tiny coral animal the size of a pinhead or at the most the human fingernail. It has a simple tube like body with tentacles at one end. Polyps take calcium carbonate from the sea water to form shells and skeletons.

They live in large colonies, each polyp residing in a tiny cup of coral. They feed on tiny swimming organisms such as larvae and tiny shellfish, as well as plenty of algae. They reproduce either from eggs or by a budding process, whereby small buds develop into new polyps. When they die, their skeletons are cemented into coralline limestone, on the top of which new generations of corals grow to extend the reef colonies.
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Anonymous commented
Coral Reefs are formed by coral [such as the great barrior reef] The great barrior reef was formed with different reefs [about 2,000] that were formed together to make one big one along Australia, That's just how the great barrior reef was formed.
But who in George Washingtons name knows how coral reefs were formed??????!!!??? Scientist? Give me proof!
Vikash Swaroop Profile
Vikash Swaroop answered
The term 'Coral reefs' is used for underwater mounds that functions as wave resistant substance and they can be called an ecosystem in themselves. The constituents that come together to form these reefs include corals, algae, mollusks, bryozoans, echinoderms, sponges and brachiopods. There are some other constituents also that play a great role in the formation of these reefs and primary among them are solid lime stones and Coral sands. While forming, the reefs go upward and create a rock like accumulation that contains calcareous skeletons that belong to the past generations of coral animals.

There are various theories that are being propagated by scientists about the phenomenon of formation but the one that has got wide respect was propagated by Charles Darwin and Reginald Daly. The theory says that fringing reefs are created along the edges of some islands and as the island starts subsiding, the creation of reefs happens.
saima jabeen Profile
saima jabeen answered
Coral reefs:Corals are formed from the secretions produced by specialized polyps that are present in certain coelenterates. These polyps become covered by stony cups due to hardening of their secretions. From the mouth of the stony cup a polyp can pass out its tentacle for the purpose of feeding and withdraw itself where not feeding. Most such coelenterates are colonial. The stony net-work or mass of such coelenterates are called corals.

Corals:Living polyps are found on the surface layer of corals where as underneath the mass are dead stony structures only and there are no polyps inside. The stony masses that are formed in this way are called coral reefs. These are mostly formed of calcium carbonated (limestone).

The corals because of their massive structure serve as living place for a variety of sea life. The coral reefs are of three types.
Fringing reef
That extends out to a distance of ¼ of mile from the shore.
Barrier reef
This is separated from the shore (main land) by a part of sea called lagoon.
Atoll reef
It is circular reef that encircles a lagoon.
Coral reefs are found in the coastal waters of Florida, West Indies, East coast of Africa, Australia and Island of Coral Sea.

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