6. The deepest lake of the US is a) Lake Ontario b) Crater Lake, Oregon c) Lake Michigan 7. The smallest state is a) Nevada b) Ohio c) Rhode Island 8. The highest waterfall is a) Niagara Falls b) Yosemite Falls c) Nevada Falls 9. There are on the American flag? a) 50 b) 51 c) 52 10. The thirteen stripes of the American flag stand for a) 13 states b) 13 colonies c 13 pilgrims 11. Thomas Edison is famous for a) barbed wire b) electric light bulb c) cotton gin