Question

The atmosphere exerts a force (pressure) on Earth. Why does the atmosphere exert pressure on earth?

A. because of the weight of air
B. because of the ozone layer
C. because of energy from the sun
D. because of the greenhouse effect

Answer 1

The reason as for why the atmosphere exerts a force or pressure, force over a given area, is because of the particles of Gases within the air, oxygen, carbon dioxide, nitrogen etc, all constitutes air, and the weight of air is ultimately what exerts pressure.

The solution is A. Because of the weight of air.