| A | B |
|---|
| A huge slow moving sheet of ice | glacier |
| a cold dry region covered with snow for more than half the year | tundra |
| permanently frozen subsoil | permafrost |
| a region of flat or rolling land covered with grasses | prairie |
| the silt left by rivers after a flood forms | alluvial |
| One major landform that is found in both the U.S. and Canada | the Rocky Mountains |
| Why are the Great Lakes important to both the United States and Canada? | They are major shipping routes. |
| How do the huge plains areas in Canada and the U.S. affect the way people live here? | The rich soil is good for farming. |
| The major natural resources of the U.S. are soil, water, timber, farmland and | minerals. |
| The boundary separating rivers flowing toward opposite sides of the continent | Continental Divide |
| watering farmland by artificial methods | irrigation |
| The landform that lies between the Rockies and the Appalachians | a huge plains area |
| Why do so few people live on the land covered by the Canadian Shield? | The land is too rugged. |
| Because much of Canada is a long way from the equator, the climate is | cold. |
| Where are the largest oil reserves in North America? | along the northern coast of Alaska |
