| A | B |
|---|
| Ice Age | Period during which low temperatures caused large areas of the Earth's water to freeze |
| Glacier | thick sheets of ice that covered Earth's surface during the Ice Age |
| Migrate | to move from one area to another |
| theory | one possible explanation for something |
| Artifact | object made by people in the past |
| Archaeologist | scientist who studies the artifacts of people who lived long ago and draws conclusions from them |
| climograph | map that shows the average temperature and precipitation for a place over a long time |
| Abbey | Noah's girlfriend |
| Annie | Abbey's best friend |
| Layne | Abbey's wannabe twin |
