| A | B |
|---|
| atmosphere | the blanket of air that surrounds Earth. |
| water vapor | water that is in the form of a gas and makes up a small portion of air. |
| nitrogen | a colorless, odorless, tasteless gas that makes up the largest part of air. |
| wind | the movement of air over Earth's surface. |
| carbon dioxide | a colorless, odorless gas that makes up a small portion of air. |
| greenhouse effect | the process by which heat from Earth is trapped by the atmosphere. |
| troposphere | the layer of the atmosphere closest to the surface of Earth. |
| oxygen | a colorless, odorless, tasteless gas that makes up the second largest part of air. |
| weather | the condition of the atmosphere at a certain place and time. |
| air | the invisible, odorless, and tasteless mixture of gases that surround Earth. |
