| A | B |
|---|
| Appalachian Mountains | one of two major mountain chains in the US and Canada. Runs north to south. 1,600 miles long. More than 400 million years old. |
| Great Plains | west of the Mississippi. largely treeless area. |
| Canadian Shield | north, rocky, mainly flat area covers nearly 2 million square miles around Hudson Bay. |
| Rocky Mountains | west of the plains, other major mountain system of the US and Canada. They are young, only 80 million years old. |
| Continental Divide | is the line of highest points in the Rockies that makes the separation between rivers flowing eastward and westward. |
| Great Lakes | Huron, Ontario, Michigan, Erie, and Superior. Eight of the world’s 15 largest lakes. With the St. Lawrence River form one of the4 world’s major shipping routes. |
| Mackenzie River | Canada’s largest River. Flows to the Arctic Ocean |
| permafrost | permanently frozen ground, Found along the arctic coast of Alaska and Canada. |
| prevailing westerlies | winds that blow from west to east in the middle of the latitudes. Found along the Pacific coast from northern California to Southern Alaska. |
| Everglades | a huge swampland that covers some 4000 square miles. Found in southern Florida |
| nomad | first inhabitants of the US and Canada. People who move from place to places |
| Beringia | a land bridge that once connected Siberia and Alaska. Scientists believe nomads migrated from Asia to US using the bridge. |
| St. Lawrence Seaway | North America’s more important deepwater ship route. Completed in the 1950s. |
| lock | sections of a waterway with closed gates where water levels are raised or lowered. Enables huge, oceangoing vessels to sail into the industrial and agricultural heartland of North America. |
