coral reef

US /ˌkɔːr.əl ˈriːf/
UK /ˌkɔːr.əl ˈriːf/
"coral reef" picture
1.

a ridge of rock in the sea formed by the growth and deposit of coral

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Divers explored the vibrant coral reef teeming with marine life.
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Climate change poses a significant threat to coral reefs worldwide.
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reefatoll
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reefcoralcoral snake