| A | B |
|---|
| divide | high point that determines the direction rivers flow |
| headwaters | where a river starts |
| tributary | brooks, rivers, streams that connect to rivers |
| fishery | places for catching fish |
| Death Valley | hottest and lowest place in U. S. |
| What caused the Hawaiian islands to form? | volcanic eruptions |
| Where does the Mississippi River begin? | Minnesota |
| Where are the U.S. and Canada's key fisheries? | Atlantic and Pacific Oceans, Gulf of Mexico |
| What key mineral is found in Canada? | potash |
| Mississippi River | one of the world's busiest commercial waterways |
| Constitution | plan of government made for the U.S. in 1787 |
| Amendment | any change made to the constitution |
| Bill of Rights | first TEN amendments |
| Acid Rain | precipitation with large amounts of dissolved acids |
| republic | form of government in which people elect their officials |
| smog | haze caused by chemical fumes |
| Underground Railroad | network of safe-houses to help slaves escape to freedom |
| Market Economy | economic system based on free enterprise |
| Timberline | the elevation above which trees cannot grow due to it being too cold |
| blizzard | snowstorms with winds over 35 mph for more than 3 hours |
