| A | B |
|---|
| air | The invisible, odorless, and tasteless mixture of gases that surrounds Earth. |
| atmosphere | The blanket of air that surrounds Earth, reaching to about 700 km above the surface. |
| carbon dioxide | A colorless, odorless gas |
| greenhouse effect | The process by which het from the sun builds up near Earth's surface and is trapped by the atmosphere. |
| nitrogen | A colorless, odorless, and tasteless gas that makes up about four fifths of the air. |
| oxygen | A colorless, odorless, tasteless gas tht makes up about one fifth of the air. |
| troposphere | The layer of the atmosphere closest to the surface of the Earth. |
| water vapor | Water that is in the form of a gas. |
| weather | The condition of the atmosphere at a certain, place, and time. |
| wind | The movement of air over Earth's surface. |
