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science 6th b.3 ch.3
6TH GRADE the 3rd chapter of the third book of 2007-2008 "weather and climate"
| vocab word | Definition |
|---|---|
| air mass | A huge body of air that has similar temperature, humidity, and air pressure at any given height |
| tropical | warm air masses that form in the tropics and have low pressure |
| polar | cold air masses that form north of 50 degrees north latitude and 50 degrees south latitude and have very high pressure |
| maritime | air masses that form over oceans. |
| continental | air masses that form over land and have little exposure to large amounts of moisture from large bodies of water |
| cyclone | a swirling center of low pressure. they revolve inward. |
| anticyclones | high-pressure centers of dry air. they revolve outward. |
| thunderstorm | a small storm often acompanied by heavy precipitation and frequent thunder and lightning. |
| lightning | a sudden spark, or electrical discharge as these charges build up between parts of a cloud. between nearby clouds, or between the cloud and the ground. |
| tornado | a rapidly whirling, funnel-shaped cloud that reaches down from a storm cloud to touch earth's surface. |
| hurricane | a tropical cyclone that has winds of 119 kilometers per hour or higher |
| storm surge | a "dome" of water that sweeps across the coast where the hurricane occurs.(imagine a hemisphere of water above you ontop of the land like a house or the top of a church. that is why when it falls it becomes very dangerous and it can destroy buildings,and |
| evacuate | to move away temporarily |
| meteorologist | scientists who study the causes of weather and try to predict it |
| isobars | lines joining places on the map that have the same air pressure |
| isotherms | lines joining places on the map that have the same tempature |