What Is An Atoll

What Is An Atoll?

What Is An Atoll
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A coral reef starts with associate degree subsurface eruption within the heat tropics, that builds a mid-ocean island. Coral then begins to create associate degree skirting reef around the island, slightly below the water's surface.

Over scores of years, the volcano erodes and sinks, whereas the skirting reef continues to rise ever higher. The constant blow of the waves eventually breaks the reef, creating channels that link the central water, known as a lagune, with the ocean.

As the reef itself crumbles, sand and different material piles on high, forming associate degree island or islets.

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