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| The way people are spread out in different places throughout the world. |
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| The use of connected ditches, canals, or pipes to move water to dry areas.[image] |
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| The long-term process in which fertile land is changed into desert. [image] |
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| A long period of time in which little or no rain falls. |
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| The movement of people from one place to another. |
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| The movement of people from the countryside to the cities. |
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| A city and all the suburbs around it. [image] |
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| A person who is descended from a certain ancestor. |
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| A small group of people made up of related families. |
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| No longer living; died out. |
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| The use of skills and knowledge to make the work of everyday life easier. |
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| A human-made object, especially from long ago. |
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| To work at only one kind of job. |
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| a group of people with a unique way of doing things |
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| any organized group of people with shared customs, traditions, and ways of life |
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| To tame plants or animals for human use. |
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| Domesticated animals, such as cattle, sheep, and pigs, that provide a resource. |
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| A person without a permanent home. |
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| A group of people whose way of life depends on herding. |
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| To prepare and use soil for the growing of crops. |
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| The raising of domesticated plants and animals; farming. |
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| To cut and burn forestlands to gain new farmland. |
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| A volcanic black rock often used by ancient people to make tools. |
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| A place in the desert that has a dependable source of water. |
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| A good brought in for sale from another place. |
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| Goods sent to other places for sale. |
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| A social system with a reliable food source and with established laws, customs, and job specialization. |
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| A tall stepped tower built by the ancient Sumerians as a temple to a god. |
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| A city and its surrounding farmlands, with its own government and leaders. |
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| A society with developed forms of religion, ways of governing, and centers of learning. |
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