Answer:
carbon dioxide
carbon in the Earth's atmosphere exists in two main forms: carbon dioxide and methane.
Answer:
There are two reasons: at higher altitudes, there is less air pushing down from above, and gravity is weaker farther from Earth's center. So at higher altitudes, air molecules can spread out more, and air density decreases
Yes because the cool air from a near by water source migrates toward the land to take the place of the hot air rising while the air over an area of water would be warmer because it is absorbing solar energy from the sun
