How is the waterfall is formed?

Answer 1

Well a normal waterfall is formed from hard rock being at the top of the falls. Beneath this hard rock, is softer rock. When the water falls off the edge of the hard rock, the hits the bottom; this is called a plunge pool. The plunge pool is also made of soft rock. When the water hits the plunge pool, some waters splahes back up and hits the back of the bottom of the falls, eventually, this wears away at the bottom making an indentation, this process is called undercutting.

So when the water flows over the hard rock at the top, it doesn't erode away as fast as the soft rock, if it did, it would just slope and looks like a river, this is what makes waterfalls so magnificant.

So when the water from Angel Falls flows over the edge, its a free fall, this means that it doesnt hit the side of the waterfall. So once it has hit the bottom or the plunge pool, it slowly erodes. Over a long period of time, the plunge pool will get deeper and deeper.

Here is an image from the web, it explains it alot easier, So type in Angel Falls.