| A | B |
|---|
| prarie | an inland grass area |
| tornado | a violent windstorm with roatating winds and a funnel-shaped cloud |
| Mississippi River | largest river in the U.S. and Canada in terms of volume and drainage area |
| blizzard | heavy snowstorm with winds of more than 35 mph |
| headwaters | the sources of river waters |
| typhoon | violent tropical storm that forms in the Pacific Ocean |
| Mt.McKinley | North America's highest mountain |
| plateau | flat landmass higher than the surrounding land with at least one steep side |
| basin | broad flat lowland area surrounded by higher land |
| Canadian Shield | a huge area of ancient rock which covers almost half of Canada |
| Continental divide | a ridge that separates rivers flowing towards opposite sides of a continent |
| fisheries | area where fish or other sea animals are caught |
| timberline | elevation above which it is too cold for trees to grow |
| chinook | seasonal warm wind that blows down the Rocky Mountains in late winter and early spring |
| Death Valley | lowest and hottest place in North America |
| maysa | flat-topped, elevated landform |
| Great Lakes | the planet's largest expanse of fresh water |
| hurricane | a large powerful wind storm that forms over warm ocean waters |
| tributary | smaller river and streams that feed into a larger river |
