Discussion
Darwin's subsidence theory is related to
Answer: B
Darwin's subsidence theory is related to coral reefs. Darwin proposed that a fringing reef round a volcanic island becomes a barrier reef and then an atoll as the island slowly sinks while the coral grows upward to stay near the surface where light is available. The theory explains why coral structures are found in deep water around many Pacific islands. It has nothing to do with marine terraces, which are raised wave-cut platforms, with the cycle of erosion, or with tides. Option B is correct.
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