| A | B |
| water cycle | repeated movement of water through the environment |
| evaporation | the changing of a liquid to a gas |
| condensation | a gas turning into a liquid |
| precipitation | the water that falls from clouds in different forms |
| hydrosphere | all of the waters of the Earth |
| reservoir | a storage area, usually for water |
| weather | the state of the atmosphere |
| barometric pressure | the pushing force of the atmosphere |
| humidity | the amount of water vapor in the air |
| circulation | the movement of air on Earth |
| climate | the weather conditions over a long time |
| latitude | a measure of distance from the equator |
| elevation | the height above sea level |