Which of the following is not an ideal condition for formation of coral reefs ........

Geography World - Water Bodies

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Which of the following is not an ideal condition for formation of coral reefs?

Sheltered coastlines with influx of nutrient rich fresh water.

Shallow water that allows enough light for photosynthesis.

Warm water above 20º Celsius.

The water should be free from sediments and silt.

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Explanation:

Option (a) is wrong because corals need fresh supply of oxygenated salty water for growth. Hence they will not survive sheltered coasts or coasts where there is influx of fresh water.
They grow best on the seaward side of the reef due to constant supply of clear oxygenated nutrient rich water from oceans.
Option (d) is wrong because sediments and silts interfere with the photosynthesis activity.