| A | B |
|---|
| axis | The imaginary linethat runs from tje North Pole through Earth's center to the South Pole |
| equator | The equator divides Earth into the Northern Hemisphere and the Southern Hemisphere. |
| Southern Hemisphere | The half of the Earth that is below the equator. |
| Northern Hemisphere | The half of Earth that is above the equator. |
| greenhouse effect | The process in which heat fron Earth is trapped by the atmospheere. |
| wind | the movement of air |
| air pressure | the push of air against its surroundings |
| barometer | device used to measure air |
| high-pressure area | areas where pressure is highter than the surrounding air |
| low-pressure area | areas where pressure is lower than the surrounding air |
| wind vane | a device used to find wind direction |
| anemometer | a devicre used to measure wind speed |
| humidity | the amount of water vapor in the air |
| relative humidity | the amount of water vapor the air is holding at a given temperature compared to the total amount that it could hold at that temperature |
| evaporate | changing from a liquid to a gas |
| condense | changing from a gas to a liquid |
| cloud | billions of tiny drops of water that condensed from the air |
| precipitation | any form of water that falls from the air to Earth's surface |
| rain gauge | used to measure the amount of precipitation |
