prehistory - ong period of time before people developed a system of writing, archaeologist - person who digs for artifacts and analyzes them, archaeology - study of past cultures through the things they left behind, artifact - objects from long ago, migrate - Move, Glacier - huge ice sheets, Technology - the way in which humans produce the items they use, Domesticate - to tame, harvest - gather (usually plants), Carbon dating - a method used to determine how old living things are, Agriculture - the raising of animals and plants for human use, nomad - people who travel from place to place, social division - a group that does a certain type of work; division of labor, culture - technology, customs, beliefs, and art of a people; the way people do things, surplus - extra supply,

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