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Weather Unit D
vocabulary cards
14
Science
4th Grade
08/20/2008

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Term
Air Pressure
Definition
The weight of air as it prsses down.
Term
atmosphere
Definition
A layer of gases surrounding Earth
Term
Greenhouse effect
Definition
The process by which heat from the Sun builds up near Earth's surface and is trapped there by the atmosphere.
Term
Weather
Definition
The conditions of the atmosphere at a certain place and time.
Term
Condensation
Definition
The change of state from a gas to a liquid.
Term
evaporation
Definition
The change of state from a liquid to a gas.
Term
precipitation
Definition
Any form of water that falls from clouds to Earth's surface.
Term
water cycle
Definition
The movement of water into the air as Water vapor and back to Earths's surface as rain, snow, sleet,or hail.
Term
air mass
Definition
A large body of air that has about the same temperature, air pressure, and moisture throughout.
Term
front
Definition
The place where two air masses meet.
Term
Climate
Definition
The average weather conditions of an area over a long period of time
Term
Polar climate
Definition
a climate that has very cold temperatures all through the year
Term
temperate climate
Definition
a climate that usually has warm, dry summers and cold, wet winters
Term
tropical climate
Definition
a hot rainy climate
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