| A | B |
|---|
| glacier | a huge sheet of moving ice |
| tributary | a river or stream that flow into another larger river |
| region | an area that is defined by certain features |
| plateau | a high, mostly flat area of land |
| climate | the usual weather conditions in an area over time |
| adapt | to change in order to live in a new environment |
| artifact | an object made by human hands |
| agriculture | farming |
| trade | the exchange of goods and services |
| culture | the way of life shared by a group of people |
| mound | a large hill-like structure, made from earth and stones |
| descendant | someone who comes from a group or family in the past |
