| A | B |
|---|
| temperature | measurement of heat in the atmosphere |
| air pressure | measurement of the force exerted by air |
| wind | horizontal motion of air between different areas of pressure |
| prevailing winds | winds that usually blow from the same direction |
| trade winds | blow from subtropical high- to equatorial low-pressure zones |
| doldrums | calm areas near the equator |
| westerlies | winds in the middle latitudes, blowing west to east |
| polar winds | winds in the high latitudes, mainly from the east |
| front | two air masses meet, causing storms |
| jet stream | prevailing winds in the upper atmosphere |
| currents | giant rivers of seawater flowing at the ocean's surface |
| evaporation | process where water changes from a liquid to a gas |
| humidity | amount of water vapor in the air |
| condensation | process where water changes from gas to liquid |
| precipitation | large, condensed water droplets |
| storms | sudden, violent weather events |
| hurricanes | severe tropical storms, forming over warm ocean waters |
| tornadoes | small, twisting spirals of air |
| aridity | low annual rainfall |
| permafrost | water below the surface stays frozen all year |
