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| is the condition of Earth's atmosphere at a particular time and place. |
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| the layer of gases that surrounds the planet. |
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| is a form of oxygen that has three oxygen atoms in each molecule instead of two. |
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| elevation or the distance above sea level. |
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| the force pushing on an area or surface. |
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| the result of the weight of a column of air pushing down on an area. |
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| an instrument that measures a change in air pressure. Two types: Aneroid |
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| the average level of the surface of the oceans. |
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| inner most or lowest level of the Earth's atmosphere. |
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| extends from the top of the troposphere to about 50km above the Earth's surface. |
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| the next layer above the stratosphere. It is the middle layer in the atmosphere. |
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| the outermost layer of the atmosphere. |
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| the lower layer of the thermosphere. Begins at 80km and ends at 550kms |
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| the outer layer of the thermosphere. Starts at 550km and extends to outer space. |
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| are lines joining places on the map that have the same air pressure. |
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| are lines joining places that have the same temperature, (thermometer) |
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| a huge body of air that has similar temperature, humidity, and air pressure throughout it. |
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| area where the air masses meet and do not mix. |
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| a swirling center of low air pressure |
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| are high-pressure centers of dry air. |
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are scientists who study the causes of weather and try to predict it. |
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