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| Nomads of the Middle East. |
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| An area with less than 10 inches of rainfall per year. |
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| The process of removing salt from seawater. |
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| Materials in the natural environment that people value and use to satisfy their needs. |
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| Someone who moves from place to place. |
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| Natural resources that cannot be replaced once they are used. |
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| An area in the desert where fresh water is found. |
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| Organization of Petroleum Exporting Countries. A group of countries that determine how much oil to produce and how much to sell the oil for. |
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| Natural resources that are constantly being replaced by the environment. |
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| Permanently settled in one place. |
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