| A | B |
|---|
| Long period of extreme cold. | Ice Age |
| Thick sheets of ice that cover the Earth. | Glaciers |
| The narrow strip of water that separates Asia from North America. | Bering Strait |
| The land that was exposed between Asia and North America during the last Ice Age. | Beringia |
| The word that means "a possible explanation." | theory |
| How the first Americans got their food. | hunting |
| The main food of the first Americans. | mammoth |
| An object that someone made in the past. | artifact |
| People who study the artifacts of people who lived long ago. | archaeologists |
| When early people did not have meat or animals to hunt, they had to gather food. They were called ______. | hunter gatherers |
| Bricks made of mud and clay are called____. | adobe |
| A method of suppling dry land with water is called_____. | irrigation |
| A culture that has developed complex systems of government, education, and religion is called a _____. | civilization |
