| A | B |
|---|
| atmosphere | The blanket of air, or gases, surrounding the earth. |
| temperature | A measure of how hot or cold something is. |
| humidity | A measure of how much water vapor is in the air. |
| air pressure | The force of air pushing down on an area. |
| thermometer | A tool used to measure temperature. |
| wind vane | An instrument that moves to show which way the wind is blowing from. |
| barometer | An instrument used to measure air pressure. |
| rain gauge | An instrument that measures how much rain has fallen. |
| air mass | A large area of the atmosphere where the air has similar properties throughout. |
| front | A boundary between two air masses that have different temperatures. |
| warm front | A boundary between air masses where a warm air mass slides up and over a cold air mass. |
| cold front | A boundary between air masses where a cold air mass pushes under a warm air mass. |
| stationary front | A boundary between air masses that are not moving. |
| forecast | A prediction or the act of making a prediction, often having to do with weather. |
| climate | The pattern of seasonal weather in a region that repeats year after year. |
| current | A directed flow of a gas or liquid. |
