| A | B |
|---|
| glaciers | thick sheets of ice |
| civilzation | well organized government, record keeping, religion, social classes |
| causeway | raised roads that connected Aztec capital to the mainland |
| chinampas | Aztec floating gardens |
| quipo | string with knots that the Incas used to keep track of quantities |
| terraces | wide steps cut into the mountainsides to help the Inca farm the dry, rugged lands |
| Ice Age people | used all parts of the reindeer |
| Europe and Asia | where humans lived 40,000 years ago |
| North America | where humans moved about 22,000 years ago |
| caves and tents | shelter for Ice Age people |
| Ice Age methods for getting food | hunting, fishing, gathering |
| Olmecs | earliest civilization in the Americas |
| surplus | extra amount of something |
| culture | entire way of life of a people |
| irrigation | innovation that helped the development of the American Southwest |
| Anasazi | farming society that lived in the Four Corners Region |
| earth mounds | used for burials and religious ceremonies |
| traders and migrating people | helped early cultures develop in North America |
| land bridge | most popular theory on how the first Americans arrived in North America |
| Mayas | lived in the lowlands of Mexico and Guatemala |
| Aztecs | lived in Central Mexico |
| Incas | lived on the west coast of South America |
| Mayan achievement | created a 365 day calendar |
| Aztec achievement | built causeways |
| Incan achievement | built rope bridges |
