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| Question | Answer |
|---|---|
| air mass | a huge body of air that has similar temperature, pressure, and humidity throughout |
| tropical | a warm air mass that forms in the tropics & has low air pressure |
| polar | a cold air mass that forms north of 50o south laititude and has high air pressure |
| maritime | a humid air mass that forms over land |
| front | the area where air masses meet and do not mix |
| continental | a dry air mass that forms over land |
| occluded | cut off as the warm air mass at an occluded is cut off from the ground by color air beneath it |
| cyclones | a swirling center of low air pressure |
| anti-cyclones | a high pressure center of dry air |
| storm | a violent disruptance in the atmosphere |
| lightning | a sudden spark or energy discharge, caused when electrical charges jump between parts of a cloud or between a cloud and the ground |
| tornado | a rapidly whirling, funnel-shaped cloud thatreaches down from a storm cloud to touch earths surface |
| hurricane | a tropical storm that has winds up to 119 km per hour or higher; typically about 600 km across |
| storm surge | a dome of water that sweeps across the land where a huricane lands |
| evacuate | to move away temperarily |
| flash flood | a sudden, violentflood that occurs withen a fewhours or even minutes of a heavy rainstorm |
| meterologist | sientists who study the causes of weather and try to predict it |
| El Nino | an abnormal climate that occurs every 2 to 7 yars in the Pacific Ocean, causeing changes in winds, currents, and weather patterns that can lead to dramatic climate changes |
| isobar | lines on a map joining places that have the same air pressure |
| isotherm | lines on a map joining places that have the same temperature |
| climate | the average, year-after-year conditions of temperature, precipatation, winds and clouds in an area |
| windward | the side of moutains that faces the oncoming winds |
| leeward | the downwind side of mountains |