| A | B |
|---|
| Convection Current | when gases or liquids rise and sink in a circular path |
| air mass | a large body of air with similar properties all through it |
| front | a boundary between two air masses |
| anemometer | a tool used to measure wind speed |
| barometer | a tool used to measure air pressure |
| rain gauge | a tool used to measure how much rain has fallen |
| climate | the average of weather conditions over a long time, usually 30 years |
