| A | B |
|---|
| alluvial soil | fertile topsoil left by a river after a flood |
| prairie | region of flat or rolling land covered with grasses |
| glacier | huge slow-moving mass of snow and ice |
| permafrost | permanently frozen layer of ground |
| tundra | cold, dry region covered with snow for more than half a year |
| Rocky Mountains | major mountain range in western North America |
| Great Lakes | world's largest group of freshwater lakes |
| hydroelectricity | electric power produced by moving water |
| provinces | political divisions of land in Canada |
| tributary | smaller river or stream that flows into a larger river |
| agribusiness | large companies that run huge farms |
| fossil fuels | sources of energy that formed from plant and animal remains |
