| A | B |
|---|
| evaporation | liquid to a vapor below boiling point |
| transpiration | leaves losing water to atmosphere |
| surface currents | ocean currents caused by wind |
| density currents | ocean currents caused by differences in temperature |
| air mass | large body of air w/fairly uniform properties |
| front | sharply defined boundary between unlike air masses |
| cold front | a cold air mass overtakes a warm air mass |
| warm front | a warm air mass overtakes a cold air mass |
| stationary front | 2 air masses have a boundary, but neither moves |
| occluded front | a warm air mass caught between 2 cooler air masses |
| cyclone | a weather system with a center of low pressure |
| anticyclone | a weather system with a swirling center of high pressure |
| thunderstorm | a small weather system that includes thunder and lightning |
| lightning | a sudden discharge of electricity in the atmosphere |
| thunder | sound caused by the rapid expansion of air along path of lightning |
| tornado | a small intense windstorm with a column of rotating air |
| hurricane | a large tropical cyclone |
| meteorologist | a person who studies weather |
| isotherm | lines on a weather map connecting points of equal temperature |
| isobar | lines on a map connecting points of equal pressure |
| climate | long term weather conditions |
| desert | region of very little precipitation |
| El Nino | periodic warming of central and eastern Pacific ocean |
| global warming | increase in average temperature of the atmosphere |
