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| Question | Answer |
|---|---|
| ice age | period when low temperatures caused large areas of earths water to freeze |
| glacier | thick sheet of ice that covered the earths surface during the time of the ice age |
| migrate | to move from one area to another |
| theory | one possible explanation for something |
| artifact | object made by people in the past |
| archaeologist | scientist who studies the artifacts of people who lived long ago and draws conclusions from them |
| ceremony | activity done for a special propose |
| mesa | high,flat land form that rises steeply above the land around it |
| drought | long period without rain |
| civilization | culture with organized systems of government, religion, and learning |
| surplus | when you have too much of something |
| slavery | a practice of owning people and forcing them to work |
| specialize | focus on one particular product, activity, or job |
| pyramid | building with three or more sides shaped like a triangle that slant toward a point at the top |
| empire | large group of lands and peoples ruled by one ruler |
| tribute | payment a ruler demands from people he or she rules |