How many tons of water flow over Niagara Falls every second?

What river passes through Paris and carries most of France's inland traffic? What is the temperature of bottom of frozen lake in winter season why? The worlds second largest river is in what continent? Is there much salt in the Red Deer river? What electricity generates from water trapped behind a dam? Why would the government concern itself with building a dam in the middle of the desert? What kind of air willan air mass that forms over the gulf of Mexico bring to Texas? Where are deserts - southern or northern? Canada's Greatest River Disaster? What is a channel along which water is continuously flowing down a slope? What is the size of Lake Tanganyika? Where is the Florida coral reef tract located? This state lies almost entirely in the huge desert called the Great Basin? Which department is responsible for preserving the environment and cultural values of your national parks and historical places? Where is the biggest windmill in the world located at? Which kind of lake is not the result of glaciation? What is the name of a self-retaining mouth gag? Which major city is found at the mouth of the chang jiang? What is the weight of London bridge? Does Grand Marnier contain sulfites?