Geography · Oceanography
What is a coral reef?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1An underwater ecosystem formed by calcium carbonate structures secreted by corals✓
- 2A ridge formed due to submarine volcanic eruptions
- 3An accumulation of silt deposited by rivers at ocean mouths
- 4Sand dunes formed by wind action on coastal regions
Correct answer
An underwater ecosystem formed by calcium carbonate structures secreted by corals
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