Which of the following statements about spring overturn is correct? It occurs when the surface water cools down to 4°C. Increased solar radiation melts the ice, and water at 4°C sinks. It is primarily driven by the cooling of air temperatures. The process involves warm surface water sinking to the bottom.

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Which of the following statements about spring overturn is correct?

A1 only

B2 only

CAll

D4 only

Answer:

Spring overturn

In spring and early summer season the increased solar radiation melts the ice cover, which, as it attains a temperature of 4 degree Celcius, becomes dense and heavy and sinks to the bottom, displacing the lower water which moves up.
This circulation of water is further helped by the prevailing summer winds and is called spring overturn

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