Water in the atmosphere

4. water vapor enters the atmosphere through a number of processes.
5. a round pellet of ice at least 5 millimeters in diameter.
7. a measure of the amount of water vapor in the air.
8. The temperature to which condensation begins.
10. a band of high-speed winds about 6 to 14 km above Earth's surface.
12. when any form of water that falls from clouds and reaches earth's surface.
13. when water vapor changes into liquid water.
14. a huge body of air that has similar temperature, humidity, and air pressure at any given height.

1. the boundary where the air masses meet becomes a front.
2. Water is always moving between the surface of earth and the atmosphere.
3. the percent of water vapor in the air compared to the maximum amount of water vapor the air can hold at a particular temperature.
6. raindrops that fall through a layer of air below 0ºC freeze into solid particles of ice before they hit the ground.
9. air masses are commonly moved by the ______ westerlies and jet streams.
11. Raindrops sometimes freeze when they hit a cold surface.
15. when water vapor in a cloud is converted into ice crystals that clump together.