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Which geologic process best explains the formation of cor... | QuestionStock

Representative image for question: Which geologic process best explains the formation of coral atolls that encircle central lagoons?

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Which geologic process best explains the formation of coral atolls that encircle central lagoons?

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Which geologic process best explains the formation of coral atolls that encircle central lagoons?

Options:

Subsidence of a volcanic island with upward coral growth
Sea-level drop exposing a fringing reef
Tectonic uplift of a coral platform
Erosion of a coastal limestone plateau

Correct answer: Subsidence of a volcanic island with upward coral growth

Explanation: Darwin's subsidence theory (proposed in 1842) explains atolls: a volcanic island slowly sinks while reef-building corals grow upward, leaving a ring-shaped reef around a lagoon.

Created 2026-03-10T17:16:15.557Z. Updated 2026-03-10T17:16:15.557Z.