hunter-gatherers, people who move around in search for food, Agricultural Revolution , being able to grow food regularly , Irrigation, bringing water to crops, surplus, having abundant amount of something, land bridge, also called Bering Strait, river valleys, where early civilizations settled next to or in, B.C., Before Christ, A.D., Anno Domini, B.C.E., Before Common Era, C.E., Common Era, latitude, lines measures distances north and south of the equator, longitude, lines measures distances east and west of the prime meridian, geography, the study of earth and its people, nomad, someone who moves from place to place in search for food; they have no home, Paleolithic Age, another name for the Old Stone Age, Neolithic Age, New Stone Age, domestication, taming animals or plants, hemispheres, Geographers divide earth into two halves called, artifacts, objects made by humans, Continents, Australia, Africa, Asia, Antarctica, Europe, North America, South America, , specialization, skilled job.

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