What causes the sinking of water during the autumn (fall) overturn? The surface water gets warmer and sinks. The surface water cools down to 4°C, becoming denser and sinking. The density of water decreases as it cools. Increased solar radiation causes the water to become heavier.

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What causes the sinking of water during the autumn (fall) overturn?

AAll

B2 only

C4 only

D1 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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