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| large raised areas of mostly level land |
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| the height of land above sea level |
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| tiny bits of rock and dirt that build up on the bottoms of rivers and lakes |
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| soil that contains substances plants need in order to grow well; soil rich in nutrients |
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| small rivers and streams that flow into a large river |
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| to artificially (not a natural way) water crops |
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| a well-watered place; a place where springs and fresh underground water make it possible to support life in a region that gets little rain |
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| people who move around to various places to make a living |
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| raising crops to support their families |
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| a system for producing, distributing, consuming, and owning goods, services, and wealth |
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