| A | B |
|---|
| Wind | The horizontal movement of air from an area of high pressure to an area of lower pressure. |
| Global Wind | Winds that blow steadily from specfic directions over long distances. |
| Jet Stream | Bands of high-speed winds about 10 km above Earth's surface. |
| Local Wind | Winds that blow of short distances. |
| Sea breeze | The flow of air from an ocean or lake to the land. |
| Land breeze | The flow of air from land to a body of water. |
| Humidity | A measure of the amount of water vapor in the air. |
| Relative Humidity | The percentage of water vapor in the air compared to the maximum amount the air can hold at that temperature. |
| Cirrus | Wispy, feathery clouds made mostly ofice crystas that form at high levels, above about 6 km. |
| Cumulus | Clouds that form less than 2 km above the ground and look like fluffy, rounded piles of cotton. |
| Stratus | Clouds that form in flat layers. |
| anemometer | An instrument used to measure wind speed. |
| Cumulonimbus | Also called thunderheads |
| Dew Point | The temperature at which condensation begins. |
| greenhouse effect | The process by which heat is trapped in the atmosphere by water vapor, carbon dioxide, methane, and othe rgases that form a "blanket" around Earth. |
| Psychrometer | An instrument used to measure relative humidity, consisting of a wet-bulb thermometer and a dry-bulb thermometer. |
| thermometer | An instrument used to measure temperature, consisting of a thin, glass tube with a bulb on one end that contains a liquid. |
