Question

define atmosphere.why is it denser in lower layers?​

Answer 1

Answer:

Because there are few gas molecules in the mesosphere to absorb the Sun's radiation, the heat source is the stratosphere below. ... The air in the mesosphere has extremely low density: 99.9 percent of the mass of the atmosphere is below the mesosphere. As a result, air pressure is very low

Explanation:

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Answer 2

Answer:

Over land at night or in winter when the ground is cold. The cold ground cools the air that sits above it, making this low layer of air denser than the air above it