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4200 years old.. The oldest ones in the world.

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How old is Great Barrier Reef?

500000 years old .


How long ago did the Great Barrier Reef begin to form?

the Great Barrier Reef is approximately 500,000 years old. However The structure of the current reef is much younger. It is less than around 8,000 years old. So it is hard to put your finger on the exact age of the Great barrier reef. This is NOT the answer to the question...It is merely speculation.


When was The Great Barrier Reef Formed?

The Great Barrier Reef was formed over two thousand years ago by nature itself.According to the Great Barrier Reef Marine Park Authority the current, living reef structure is believed to have begun growing on an older platform of coral reef about 20,000 years ago. The older coral reef platform is believed to be 500,000 to 600, 000 yeas old.


How long did it take to build the barrier reef?

the Great 500,000 years old. The current reef's structure of it is less than 8,000 years old.


How old is the barrier reef?

one million years or more


Who found out that the Great Barrier Reef can been seen from space?

Sounds lke the old Aussie Sir Arthur C. Clarke.


How do living and nonliving things interact with another in the Great Barrier reef?

Great barrier reefs are actually on top of the dead and old reefs and sea anemones. So the non living reefs are the foundations and support for the living reefs.


How long has Great Barrier Reef lasted?

That depends upon how quickly mankind destroys it. If it is maintained and protected it could last indefinitely.


What is the climate of a coral reef?

Well, Coral Reefs are usually found in tropical waters (near the Tropic of Cancer). The water temperature in coral reef areas usually ranges in the 70s and 80sºF. But Reefs can also be man made by sinking ships and such, but they usually aren't coral reefs.


How old was the longest living brittle star?

1200 years old. It is still alive. It is an ancient Brittle Star in the Great Barrier Reef. They say that it is almost 20 feet across. It has gained sentience during its long life span, and today goes by the name "Gordan". Gordan the Enchinoderm.


Name the most famous attractions in Australia?

The Sydney Opera House - Sydney The Parliament and Old Parliament Houses - Canberra Sydney Harbour Bridge - New South Wales The Three Sisters - New South Wales The Great Barrier Reef - Southern Australia For more see http://en.wikipedia.org/wiki/Australian_Landmarks


What is the largest natural feature in the world?

An Underground FungusThe Honey Fungus (Armillaria Ostoyae) Mushroom. The largest specimen has roots that reach 890 hectares (2,200 acres)The "Blue Whale" is the largest animal known to have inhabited the planet.(see related question)