Multiple Choice
The atmosphere is densest closest to the surface of Earth because
A) the types of gases are different compared to higher up in the atmosphere.
B) the force of gravity decreases closer to Earth's surface.
C) solar wind strips the atmosphere of oxygen molecules close to Earth's surface.
D) the weight of the gas higher in the atmosphere pushes down on the gas below.
Correct Answer:

Verified
Correct Answer:
Verified
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