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        | Term 
 | Definition 
 
        | one of seven large landmasses on earths suface |  | 
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 | Definition 
 
        | a large rigid section of the earths crust that is in constant motion |  | 
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        | a sudden movement of the earths crust followed by a series of shocks |  | 
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        | a zone of volcanoes around the pacific ocean |  | 
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        | an opening in the earths crust from which molten rock,ash, and hot gases flow or are thrown out |  | 
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        | the gradual physical and chemical breakdown of rocks on the earths surface |  | 
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        | the wearing away and movemean of weathered materials by water, wind, and ice |  | 
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        | peices of rock in the form of sand,water, or ice |  | 
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        | a large, slow moving mass of ice |  | 
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        | the area drained by a major river |  | 
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 | Definition 
 
        | water found beneath the earths surface |  | 
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 | Definition 
 
        | the circulation of water between the earths, the oceans, and the atmoshere |  | 
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        | a feature on the earths surfaceformed by physical forces |  | 
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        | a broad, flat area of land higher then the surrounding land |  | 
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 | Definition 
 
        | the difference in the elevation of a landform from its lowest point to its highest point. |  | 
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        | the submerged land at thge edge of a continent |  | 
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 | Definition 
 
        | the layer of gas that surrounds the earth |  | 
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 | Definition 
 
        | the time during the year when the sun reaches the farthest northern or southern part in the sky |  | 
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 | Definition 
 
        | one of the two times of the year when the sun's rays are over the equator and the days and night arount the world are an equal lenth |  | 
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        | the condition of the earths atmosphere at a given time or place |  | 
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        | the typical weather conditions of a region over a long period of time |  | 
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        | falling water droplets in the form of rain, snow, or sleet |  | 
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        | an area that has similar plants |  | 
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 | Definition 
 
        | a vegetation region with a mix of grassland and scattered trees |  | 
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        | a region with plants specially adapted to dry conditions |  | 
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        | an increase in the average temperature of the earths atmosphere |  | 
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        | the trapping of the sun's heat by gases in the earths atmosphere |  | 
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        | any gases in the atmosphere  that contributes to the greenhouse effect |  | 
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        | fuels such as coal,oil, and natural gases |  | 
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        | the process in which farmland becomes less productive because the land is degraded |  | 
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 | Definition 
 
        | using natural resources in a way that they exist for future generations |  | 
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        | a gas composed of carbon and oxygen |  | 
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 | Definition 
 
        | substances discharged into the air |  | 
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