Atmosphere

5. The layer of the atmosphere closest to the Earth's surface.
7. The process in which gases trap heat near the Earth.
11. The greenhouse gas emitted mostly from human activity this century.
12. Makes up 21 percent of the atmosphere.
13. the layer of the atmosphere above the troposphere, where temperature rises as altitude increases due to ozone absorbing the sun's UV energy.
14. The layer of the atmosphere above the mesosphere where nitrogen and oxygen atoms that absorbs solar radiation become electrically charged ions that glow in the night skies.
15. The transfer of energy across space and in the atmosphere.

1. A mixture of gasses surrounding the Earth.
2. A thick layer of the atmosphere above the stratosphere, and also the coldest.
3. The gases that trap and radiate heat.
4. The greenhouse gas emitted from cattle.
6. A molecule made up of three oxygen atoms which absorbs UV radiation
8. The flow of heat from a warmer object to a colder object when the objects are placed in direct physical contact.
9. The transfer of heat by air currents.
10. Tiny liquid droplets in the air that may contain bacteria and viruses.