| A | B |
|---|
| theory | idea that tries to explain something |
| peoples | groups of people who have the same way of life |
| campsite | place to set up a shelter where people can live for a short time |
| dwelling | where people live |
| customs | special ways that a group of people does things |
| geographical features | important parts of Earth, such as oceans and mountains |
| game | animals that people hunt for food |
| enormous | very large |
| herds | large groups of animals that eat grass |
| tepees | Native American cone-shaped tents |
| asthma | illness that causes difficulty in breathing |
| harvest | fruit and vegetables that farmers gather from the fields |
| weaving | making cloth |
| breed | help animals reproduce |
| unique | the only one of its type |
| architects | people who design buildings |
| family tree | treelike illustration of family members and relationships |
| generation | all the people who are about the same age |
| natural resources | things from the Earth that people use, such as trees and minerals |
| vanished | disappeared |
| mounds | hills |
| civilization | developed society |
| arid | extremely dry |
| climate | generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years |
| environment | surroundings |
| irrigate | to supply (land) with water by artificial means |
| nomads | members of a group of people who have no fixed home and move according to the seasons from place to place in search of food, water, and grazing land |
| region | area |
| tribe | any aggregate of people united by ties of descent from a common ancestor, community of customs and traditions, adherence to the same leaders, etc. |
