| A | B |
|---|
| Transpiration | theprocess by which plant leaves release water |
| Atmosphere | the air that surrounds Earth. The atmosphere reaches from the Earth's surface to the edge of space. (about 310 miles) |
| Air Pressure | The force put on a given area by the weight of the air above it. |
| Molecules | The smallest piece that a substance can be broken into. |
| Lithosphere | The hard outer layer of Earth. (about 100 kilometers thick) |
| Crust | The rocky surface that makes up the top of the lithosphere. (Includes the continents and the ocean floor.) |
| Resource | Any material that helps support life on Earth. |
| Hydrosphere | Earth's water |
| Barometer | A device for measuring air pressure. |
| Water vapor | Water in the form of a gas. |
| Humidity | The amount of water vapor in the air. |
| Evaporation | The changing of a liquid into a gas. |
| Relative humidity | A comparison between condensation and evaporation. |
| Condensation | The changing of a gas into a liquid. |
