How Are Atolls Formed?

Answer

Atolls are formed first as a reef that fringes a volcanic island. As the island sinks after the volcanic activity has stopped and the Earth crust has cooled, the reef continues to build upward, finally ending up as a ring-shaped structure. These ring-shaped islands or arc of islands are made almost entirely out of coral.
Q&A Related to "How Are Atolls Formed?"
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