Answer:
1. is atmosphere
2. is air pressure
3. green house gases
4a. nitrogen
4b. oxygen
4c. carbon dioxide
5. stratosphere
6. troposphere
7. Air pressure is higher at lower altitudes. Air density is higher at lower altitudes. There is more space between air molecules at higher altitudes. There is less oxygen to breathe at the top of a high mountain than there is at sea level.
8. exosphere, this is because the air is thin, therefore making it cold
9. Without this barrier in place, all of the radiation would reach Earth, which is very damaging to plants and us.
10. Temperature increases as you gain altitude in the stratosphere and the thermosphere. Temperature decreases as you gain altitude in the troposphere and mesosphere.
11. When the level of greenhouse gases increase, the concentration of gases in the atmosphere would become greater. This event allows the gas molecules to increase in number, As a result, the air temperature increases.
note: 12 and 13 you are going to have to workout for yourself as I have no clue lol-
hope this helps :)
