How Does A Waterfall Form?

Waterfalls are formed when water flows over hard rocks and soft rocks ( the hard rocks lies above the soft rocks). The water that flows over the rocks cause the soft rocks to deepen or move further inland while the harder ones remain intact. Because of this, there will be depressions as the softer rocks are less resistant to the force exerted by the running water. Over time, parts of the soft rock will erode and the hard rocks will be suspended in the air, while the softer rocks are pushed further inland. Since the rocks are located on high ground, the water plunges downwards to form a plunge pool.

Block, Cascade , Cataract, Tier, Plunge and segmented waterfalls are some types of waterfalls. The depth of most waterfalls vary. However, they can be quite deep, especially those located near seas and oceans. It is best not to swim in waterfalls as most are quite deep and strong currents are present.

Also, try WWW.WIKIPEDIA.ORG.

A water fall is formed when water falls!
Actually, a waterfall is formed when the water flowing from a river falls  off a cliff. The longest waterfall is Victoria falls on Zambezi river in Africa. The shortest one is in my bathroom.

The hard resistant surface rock is left unsupported as the softer ones get eroded more quickly by the river