The spherical shape of rain drops is due to __________________.
A
Atmospheric friction of air
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B
Gravity of spherical earth
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C
Surface tension of rain water
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D
Viscosity of rain water
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Solution
The correct option is D Surface tension of rain water Raindrops start to form in a roughly spherical structure due to the surface tension of water. This surface tension is the "skin" of a body of water that makes the molecules stick together. The cause is the weak hydrogen bonds that occur between water molecules.