Answer :

Coral reefs are underwater structures composed of skeletons of colonial marine invertebrates. They are formed in the areas having following conditions:

1. Tropical areas are required. These are the areas near equator.

2. High salinity is required. Water having high salt content is needed.

3. Influx of fresh water should not be there.

4. No siltation should occur. This means accumulation of fine mineral particles in the water should not take place.

All these conditions are favourable in Tamil Nadu and on the east coast of India but are not found in the regions from west Bengal to Andhra Pradesh

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