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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 wordDefinition
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
Created by: Meredith Daniel