Weather

4. The continuous process by which water moves from Earth's surface to the atmosphere and back
5. The average weather conditions in an area over a long period of time
9. The condition of Earth's atmosphere at a particular time and place
11. A narrow belt of strong winds that blow in the upper troposphere
12. air mass that forms over cold regions
13. a measure of the amount of water vapor in the air
14. a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants
17. A boundary between two air masses
19. The change of state from a gas to a liquid
20. the envelope of gases surrounding the earth or another planet

1. Gases such as carbon dioxide, methane, nitrous oxide, water vapor, and ozone in the atmosphere which are involved in the greenhouse effect
2. The percentage of water vapor in the air compared to the maximum amount of water vapor that air can contain at a particular temperature
3. The change of a substance from a liquid to a gas
6. instrument used to measure humidity
7. Any form of water that falls from clouds and reaches Earth's surface
8. A warm air mass that forms in the tropics and has low air pressure
10. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
15. A huge body of air that has similar temperature, humidity, and air pressure at any given height
16. The horizontal movement of air from an area of high pressure to an area of lower pressure
18. a front where a warm air mass is caught between two colder air masses and brings cool temperatures and large amounts of rain and snow