The Great Barrier Reef - Underwater Wonders of the World

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Great Barrier Reef looks almost like a wall of perpendicular rock rising out of the sea m only it is not rock; it is coral. The Great Barrier Reef lies underwater and has snared many ships, including Captain Cook's in 1770. Though being one of the world's longest natural wonders, it unfortunately is also the most fragile around. The Great Barrier Reef is one of the seven underwater wonders of the world and one of the seven wonders of the world.

It is a sweeping 2,000 kms in length, spanning along the northeast coast of Australia. It covers an area of 344,000 square kms and is made up of the skeletons of marine polyps that lived and died there, so it is generally lime-based. Sometimes the Great Baffier Reef is as close as 50 kms to the coast.

The Great Barrier Reef consists of more than 3000 reefs spanning from I hectare to 10,000 hectares in area and is mainly made up of coral. The reef, however, is not just about polyps dead or alive they are also large numbers of different forms of marine life. There are colourful and exotic fishes, countless shellfish and other fanciful creatures. It abounds in wildlife. The variety of marine life ranges from nearly microscopic fishes to that of the larger fishes like the whale and the sharks.

There are more than 1500 species of fish, 4000 types of mollusk and, because of the abundance of fish, the reef is also home to more than 200 species of birds. The Great Barrier Reef houses anything and everything that thrives in shallow warm water.

It is also the only collection of organisms visible from Earth's orbit. It was declared a World Heritage in 1981. However, conditions like pollution, climatic change and various forms of human intrusion severely threaten its survival and continuance.

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