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Q.

In summer, a mild wind is often found on the shore of a calm river. This is due to

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a

Difference in thermal conductivity of water and soil

b

Convection currents

c

Conduction between air and the soil

d

Radiation from the soil

answer is B.

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Detailed Solution

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During day time, Earth is hotter than river water. So, air above earth is hotter than that above water. Hot air above Earth rises and its place is taken up by colder air coming from water.

During night time, Earth is colder than river water. So, air above earth is colder than that above water. Hot air above water rises and its place is taken up by colder air coming from Earth.

This is natural convection process.

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