❄️ answer:❄️

4.A

because↓

From lowest to highest, the major layers are the troposphere, stratosphere, mesosphere, thermosphere and exosphere.

5.D

because↓

troposphere

Thus, we can say that almost all known weather phenomena take place in the troposphere. Mesosphere is the third layer of the atmosphere, and is mainly responsible for burning off meteors that enter the earth's atmosphere.

6.A

because↓

The thermosphere is often considered the "hot layer" because it contains the warmest temperatures in the atmosphere. Temperature increases with height until the estimated top of the thermosphere at 500 km. Temperatures can reach as high as 2000 K or 1727 ºC in this layer (Wallace and Hobbs 24).

7.D

because↓

Troposphere layer of the atmosphere has the highest density of gas molecules.

8.A

because↓

Once the sun's energy reaches earth, it is intercepted first by the atmosphere. A small part of the sun's energy is directly absorbed, particularly by certain gases such as ozone and water vapor. Some of the sun's energy is reflected back to space by clouds and the earth's surface

9.D

because↓

The troposphere is the lowest layer of the atmosphere. In it, temperature decreases with altitude. The troposphere gets some of its heat directly from the sun.

10.A

Because↓

When fossil fuels are burned, they release nitrogen oxides into the atmosphere, which contribute to the formation of smog and acid rain. Major sources of nitrogen oxide emissions include: Cars and trucks. Coal-fired power plants

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