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| A simplified idea that is used to describe a group of people. |
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| A semi-arid climate region that is located below the Sahel. |
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| A long period of time without rainfall. |
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| An area of land that is not heavily populated and in a countryside. |
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| An area that is completely surrounded by land (no water). |
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| Land that can be used to grow crops. |
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| The process of turning arable land into desert. |
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| How many people live in an area per square mile. |
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| An area that has a large number of people per square mile. |
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| An area with a small number of people per square mile. |
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| Growing only enough food to feed a family. |
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Definition
| The use of machines to make things to use or sell. |
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