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Geography

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Across
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A region with plants specifically adapted to dry conditions
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Fuels such as coal, oil, and natural gas
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Substances discharged into the air
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Any gas in the atmosphere that contributes to the greenhouse effect
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An area that has similar plants
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The typical weather conditions of a region over a long period of time
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The process in which farmland becomes less productive because the land is degraded
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One of the two times a year when the sun's rays are over the equator and days and night around the world are equal in length
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Of lower quality
Down
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The trapping of the sun's heat by gases in the Earth's atmosphere
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An increase in the average temperature in the Earth's atmosphere
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Falling water droplets in the form of rain, snow, sleet, or hail
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A gas composed of carbon and oxygen
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Using natural resources in a way that they exist for future generations
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The time during the year when the sun reaches the farthest northern or southern point in the sky
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The condition of the Earth's atmosphere at a given time and place
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A vegetation region with a mix of grassland and scattered trees