[Answer] What geological formation is formed by coral?

Step 1 : Introduction to the question "What geological formation is formed by coral?"

...An atoll is a ring-shaped reef or island made of coral and surrounding a shallow body of water called a lagoon. Atolls are formed when underwater volcanoes erupt and eventually rise above the surface to create islands; coral reefs then grow around the islands, remaining in place even as the islands themselves erode to form lagoons. Atolls make up the island nations of Maldives and Kiribati, but are naturally at risk from erosion and rising sea levels.

Step 2 : Answer to the question "What geological formation is formed by coral?"

Atoll:

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