Geography · Oceanography
What are coral reefs primarily composed of?
- 1Metamorphic rock formations shaped by ocean currents
- 2Calcium carbonate skeletons secreted by tiny marine polyps✓
- 3Skeletons of deep-sea siliceous sponges
- 4Accumulated remains of marine volcanic ash
Correct answer
Calcium carbonate skeletons secreted by tiny marine polyps
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