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| An official policy of racial separation formerly practiced in South Africa. |
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| A system by which a country maintains colonies outside its borders. |
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| The process by which land that can be formed or lived on turns into desert. |
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| A long period of time without rain. |
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| A person who goes to another country to do religious and social work. |
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| A resource that cannot be replaced or that can be replaced only over millions of years. |
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| A process in which animals graze grass faster than it can grow back. |
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| A raised area of relatively level land. |
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| A resource that can be used and replaced over a relatively short time period. |
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| A semiarid region south of the Sahara Desert. |
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| A penalty imposed upon a nation that is violating international law. |
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| A method of farming in which people grow food mainly to feed their households rather than to sell. |
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| The movement of people from the countryside to cities. |
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