What are waterfalls?
Sometimes the surface over which a river flows drops suddenly. Then the water flows over to form a waterfall. There are different kinds of waterfalls. A cascade waterfall flows down a collection of herbal rock steps. There are no steps in a free-falling waterfall. In a fan waterfall, the water spreads out as it falls down. Angel Falls in Venezuela is the highest free-falling waterfall in the world. The water falls 807 metres (2,648 feet) barring any interruption. Often, the daylight falling over a waterfall creates a rainbow.
