| A | B |
|---|
| a long, cold period of time when thick sheets of ice covered the earth | the Ice Age |
| thick sheets of ice that cover parts of the earth | glacier |
| where the first Americans came from | Asia |
| a narrow waterway that connects two larger bodies of water | strait |
| the reason the people crossed over from Asia | they followed animal herds |
| the reason people were able to survive during the Ice Age | they discovered how to make and use fire to cook their food and stay warm |
| separates North America from Asia today | Bering Strait |
| large Ice Age animal hunted by the first Americans | Wooly Mammoth |
| how the people fed themselves when the Ice Age ended and the large animals became extinct | they became gatherers and farmers |
| as they learned more about farming they grew more than they needed | a surplus |
| a system of ditches used for bringing water to dry fields | irrigation |
| the dry land that probably joined Asia and North America during the Ice Age | land bridge |
| a people's way of life | culture |
| scientists who dig up things from the past to learn about a culture | archaeologists |
| objects left by the people who lived long ago | artifacts |
| study or record of what happened in the past | history |
| a person who studies the past | an historian |
| eyewitness accounts, letters, newspapers,etc. | primary sources for an historian |
| accounts of the past written by someone who was not an eyewitness | secondary source for an historian |
