| A | B |
|---|
| Appalachian Mountains | One of two major mountain ranges in the eastern United States and Canada, extending 16,00 miles from Newfoundland south to Alabama. |
| Great Plains | A vas grassland of central North America that is largely treeless and ascends to 4,000 feet above sea level. |
| Canadian Shield | The northern part of the interior lowlands that is a rocky, flat region covering nearly two million square miles and encircling Hudson Bay. |
| Rocky Mountains | A major mountain chain of the United States and Canada, extending 3,000 miles from Alaska south to New Mexico. |
| Great Lakes | A group of five freshwater lakes of central North America between the United States and Canada; the lakes are Huron, Ontario, Michigan, Erie, and Superior. |
| Mackenzie River | Canada's longest river, which is part of the system that flows across the Northwest Territories to the Arctic Ocean. |
| permafrost | Permanently frozen ground. |
| prevailing westerlies | Winds that blow from the west to east. |
| Everglades | A large subtropical swampland in Florida of about 4,000 square miles. |
| nomad | A person with no permanent home who moves according to the seasons from place to place in search of food, water, and grazing land. |
| Beringia | A land bridge thought to have connected what are now Siberia and Alaska. |
| St. Lawrence Seaway | North America's most important deepwater ship route, connecting the Great Lakes to the Atlantic Ocean by way of the St. Lawrence River. |
| lock | Section of a waterway with closed gates where water levels are raised or lowered through which ships pass. |
