| A | B |
|---|
| tributary | a stream or river that flows into a larger river |
| fossil fuels | sources of energy from plant and animal remains |
| glaciers | huge slow moving sheets of ice |
| prairies | North American grasslands |
| alluvial soils | fertile topsoil left by a river after a flood |
| Appalachians | Second highest mountain system in the U.S. |
| hydroelectricity | electric power generated by moving water |
| Mt. McKinley | highest mt. in the U.S. |
| Atlantic Ocean | ocean that borders US and Canada to the east |
| Rocky Mountains | largest mt. system in the U.S. |
| U.S. | only country that Canada borders |
| Mt. St. Helen's | volcano that erupted in the Cascade Mts. in 1980 |
| Mississippi | Largest river in th U.S. |
| Contenintal Divide | boundary that separates rivers from Pacific and Atlantic oceans |
| MacKenzie | longer river in Canada |
| Huron, Ontario, Michigan, Erie, Superior | Great Lakes |
