Air pressure is greatest ____ because there are more molecules of air pushing down from above. a. at the top of the mountain c. in the troposphere b. at sea level d. in the exosphere

Answer:

The answer is B, at sea level.

Explanation:

Air pressure is greatest at sea level because there are more molecules of air pushing down from above. Thus, option 'B' is the correct option.

The lowest point in the atmosphere has the highest atmospheric pressure. Additionally, here is where the air is densest. As one ascends higher in the atmosphere, pressure and density drop. The mass of the atmosphere is drawn toward the surface of the earth by its gravitational field.

In actuality, 99.99997% of the atmosphere's bulk is contained within 100 kilometers of the earth's surface, whereas 90% of the atmosphere's mass is contained within 16 kilometers (Lutgens 17). The typical free route between air molecules is approximately 10 km at 600 km (Lutgens 18). From this point on, the atmosphere keeps getting thinner with height until it eventually combines with space itself.

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