Clouds continually are pulled to the ground by gravity. Why do they stay aloft?

A. New cloud droplets continually replace those that fall to Earth's surface.
B. Water evaporating from Earth's surface presents an opposing force to the falling cloud droplets.
C. Updrafts of air oppose the gravitational force.
D. Clouds weigh so little that they fall too slowly to be noticed.


Answer: C

Environmental & Atmospheric Sciences

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