| A | B |
|---|
| tundra | A vast, treeless plain in arctic or subarctic places such as Alaska and northern Canada. |
| isthmus | A narrow strip of land that connects two larger land masses. |
| Andes Mountains | The world's longest mountain chain, stretching along the west coast of South America. |
| Great Lakes | A group of five large freshwater lakes on the border between the United States and Canada. |
| Rocky Mountains | A mountain range in North America that stretches from Alaska into Mexico. |
| Canadian Shield | A large rocky plain in northern Canada that was formed by glaciers during the Ice Age. |
| tribute | A tax, often in the form of crops, paid by one ruler to another, usually to ensure peace or protection. |
| Triple Alliance | The pact that the army of the Aztec made with the forces of Texcoco and Tlacopan in 1428 in order to gain control of the Valley of Mexico. |
| Tenochtitlan | The capital of the Aztec empire, founded around 1325 on the site of present-day Mexico City. |
| Valley of Mexico | A fertile valley between two mountain chains in central Mexico. |
