The Water Cycle

3. The envelope of gases that surrounds Earth.
5. Fluffy, white clouds, usually with flat bottoms, that look like rounded piles of cotton.
8. Wispy, feathery clouds made of ice crystals that form at high levels.
9. The temperature at which condensation begins.
10. Any form of water that falls from clouds and reaches Earth's surface.
12. An instrument used to measure relative humidity.

1. The process by which molecules of water vapor in the air become liquid water.
2. The amount of water vapor in a given volume of air.
4. The process by which water molecules in liquid water escape into the air as water vapor.
6. Clouds that form in flat layers and often cover much of the sky.
7. The continual movement of water among Earth's atmosphere, oceans, and land surface through evaporation, condensation, and precipitation.
11. A visible mass of condensed water vapor floating in the atmosphere.