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GS Geography Physical Geography of World
Q.

The stagnant water at the bottom of a lake is called:
Explanation:

ANS. (D) 
The top band of a lake is called the epilimnion; while the middle band is called the thermocline and holds water whose temperature varies with depth. The bottom band is called the hypolimnion and holds cool, stagnant water which is all the same temperature.

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