What is a river descending steeply called?

What Russian lake is a source of several Mongolian rivers? How much is it to get into the water park at Cedar Point? What were the two british held seaports along the gulf coast that spanish troops attacked? Where is the sarospatak castle located? Does London bridge open? Why was the Huang river called the river of sorrows? Define Indian Ocean trade complex? Why is cheese important to french culture? What is the name that the river that serves as a border between Belize and Mexico? How is the Nike river and the Tigris and Euphrates Rivers alike? Who was the first person given credit to climb mount Everest? Which type of currents are directly controlled by winds? When a flood erodes the sides of a river where do the materials go? Was the Great Wall of China built as a decoration? Does the Columbia river run into the Pacific Ocean? What did Charles borromeo accomplish? What wetlands would have large numbers of cattails and other grass like plants? What kind of rock is the colosseum made of? What are the areas of sediment deposit where a river's mouth reaches flat land at the bottom of a mountain? What kind of animals live by the equator?