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| The area drained by a major river |
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| Water found beneath the Earth's surface |
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| the cirulation of water between the Earth ,the oceans, and the atmosphere |
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| A feature on th eEarth' ssurfacw formed by physical force |
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| A board, flat area of land higher than the the surrounding land |
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| the difference in the elevation of a landform from lowset point to it's highest point |
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| The sudmerges land at the edge of a continent |
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| The layer of gases that surround the Earth |
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| The time during the year when the sun reaches the farthest northren or southren point in the sky |
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| one hof the two times a year when the suns rays are over the equator and days and night around the world are equal in length |
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| The conition of the Earth;s atmosphere at a given time and place |
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| The typical weather conditions of a region over a lond period of time |
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| Falling water droplets in the form of rain,snow sleet, or hail |
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| an area that has similar plants |
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| A vegetation region with a mix of glassland and scattered trees |
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| a region wtih plant specially adapted to dry conditions |
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| an increase in the average temperature of the Earth's atmosphere |
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| The trapping of the suns heat by gases in the Earth's atmosphere |
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| any gas in the atmosphere that contributes to the greenhouse effect |
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| fuels such as coal, oil, and natural gas |
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| the process in which farmland becomes less productive because the land is degraded |
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| Using natural resources in a way that they exist for future generations |
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| a gaas composed of carbon and oxygen |
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| substances dischanged into the air |
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| one of seven large landmasses on the Earth's surface |
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| large rigid section of the Earth's crust that is in constant movement |
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| a sudden movement of the Earth's crust followed by a series of shock |
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| a zone of volcanoes around the Pacific Ocean |
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| An opening in the Earth's crust fron which molten rock,asj,and hot gases flow or are thrown out |
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| The gradual physical and chemical breakdown of rocks onn the Eaths surface |
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| The wearing away and movement of weathered materials by water , wind, or ice |
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| pieces of rock in the from of sand,stone,or silt deposited by wind,water , or ice |
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| A large, slow-moving mass of ice |
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