How do people get hurt on the Niagara falls river?

What does the boreal forest look like? What is the nickname of the Washington Monument? In Yellowstone national park what is a steamboat? How does the gradient at a stream's headwaters affect its speed and channel? Where does the Colorado river lead to? What are the three economical benefits for forest ecosystems? How is the painted Desert related to other North American deserts? Which ocean has the most icebergs? How many bridges did the Romans build across the Thames? Statue or building to remember veterans? Contrast the water in oceans with fresh water? How is the electricity like a river? Wonder of the world in Mexico? Where is the National Farm Toy Museum in Dyersville Iowa located? What country has many tropical forests where toucans and other tropical birds live? What river borders Louisiana and Texas? Sand dunes in the desert are caused by erosion from? Ocean created when the super continent broke apart? What attracts tourists in a country? Is the windseeker at knotts berry farm open?