Question 1 What do we know by term waterfall and how they generate?
Answer : When water falls on ground from a height because of some natural activity that may include water flowing over a vertical drop in the course of a stream or a river. It may also be caused by some water melting activity of any natural resource that is melting edge of a tabular iceberg or ice shelf etc. One of the causes of waterfall is when a river is new its channel is very narrow and deep. As soon as it grows elder, volume of water increases implies water course expands and it plucks the river bed results in erosion of soil or other material surface. In this way we are able to see a waterfall. Also sometimes slow processes such as erosion, earth movement caused by earthquakes or landslides or volcanoes can cause a difference in land heights which can obstruct the natural course of a water flow, and result in waterfalls. Many waterfalls are formed due to melting glaciers example is frozen falls. There are many types of waterfalls like Ledge Waterfall, Block/Sheet waterfall,Fan waterfalls, Classical waterfalls ( fall height is nearly equal to stream width, forming a vertical square shape), Curtain waterfalls(Ledge waterfalls which cover a height larger than the width of falling water stream), Plunge waterfalls( with fast moving water descends vertically, losing complete contact with the bedrock surface and the contact is typically lost due to horizontal thrust of the water before it falls. It always starts from a narrow stream),Punchbowl waterfalls,Chute waterfalls (with a huge quantity of water forced through a narrow, vertical passage) Slide waterfalls, Ribbon waterfalls,Horsetail (Descending water maintains good touch with bedrock most of the time) etc.