1. What is the name of the lake formed by the Hoover Dam on the Colorado River?   Lake Tahoe   Owens Lake   Great Salt Lake   Lake Mead   Hint Half-n-half Clue   2. Which is the tallest active geyser in the world?   Mount Pinatubo   Waimangu   Krakatau   Giant in Yellowstone National Park   Half-n-half Clue   3. Which river forms a natural border between the US and Mexico?   Red River   Mississippi River   Rio Grande   Gila River   Half-n-half Clue   4. In which state is the Yellowstone National Park located?   Colorado   Nebraska   North Dakota   Wyoming   Half-n-half Clue   5. Which of the Great Lakes is the only one to lie entirely in the United States?   Lake Erie   Lake Superior   Lake Huron   Lake Michigan   Half-n-half Clue   6. Where does the Mississippi River start?   Lake Itasca   Allegheny Mountains   Appalachian Mountains   Cumberland Plateau   Half-n-half Clue   7. Which is the freshwater lake with the largest surface area in the world?   Caspian Sea   Lake Michigan   Lake Erie   Lake Superior   Half-n-half Clue