Discussion :: Hydrosphere
- Coral reefs are formed by ________
|
A.
Volcanic rocks |
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B.
Marine sediments |
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C.
Chlorine material precipitated from sea water |
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D.
Tiny colonial marine animals which construct limestone skeleton material |
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Answer : Option D
Explanation :
Coral reefs are formed by tiny colonial marine animals which construct limestone skeleton material. Massive reef structures are formed when each individual stony coral organism or polyp secretes a skeleton of calcium carbonate.
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