| A | B |
|---|
| air | the invisible, odorless, and tasteless mixture of gases that surrounds Earth |
| atmosphere | the blanket of air that surrounds Earth, reaching about 435 miles above the Earth's surface |
| carbon dioxide | a colorless, ordorless gas that plants use to make food |
| greenhouse effect | the process by which heat from the Sun builds up near Earth's surface and is trapped by the atmosphere |
| meteorologist | a scientist who studies the atmosphere and forecasts the weather |
| nitrogen | a colorless, odorless, tasteless gas that makes up four-fifths of the air and is used by plants for growth |
| oxygen | a colorless, odorless, tasteless gas that make up one-fifth of the air and is essential for animals to live |
| troposphere | the layer of the atmosphere closest to the Earth's surface and is the layer where all weather occurs |
| water vapor | water that is in the form of a gas |
| wind | the movement of air over Earth's surface |
| weather | the condition of the atmosphere at a certain place and time |
| air pressure | the push of the air in all directions against its surroundings |
