| Term | Definition |
|---|
| drought | a long period without rain |
| glacier | thick sheets of ice |
| migrate | movement of people to another land |
| theory | a possible explanation |
| artifact | an object that someone made in the past |
| specialize | do only one kind of job |
| ceremony | activity done for a special purpose or event |
| mesa | high, flat landform that rises steeply from the land around it |
| civilization | culture with organized system of govenment, reglion, and learning |
| ice age | long period of extreme cold on Earth |
| tribute | payment demanded by rulers from the people they rule |
| slavery | the practice of holding people against their will |
| surplus | more than is needed |
| empire | a group of lands and people ruled by one leader |
| archaeologist | one who studies artifacts of people |
| pyramid | building shaped like a triangle |
Combine with other sets
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