* Erosion: The process of water flowing over a rock face causes erosion. The force of the water wears away the rock, creating a drop or a steep incline.

* Deposition: Deposition is the process of sediments being dropped or laid down. This is the opposite of erosion and wouldn't create a waterfall.

How waterfalls form:

1. Resistant Rock: A waterfall usually forms where a layer of hard, resistant rock (like granite or limestone) overlays a softer layer (like sandstone or shale).

2. Water Flow: Water flows over the rock, eroding the softer layer more quickly than the hard layer.

3. Undercutting: The erosion of the softer layer creates an undercut, leaving the hard layer as a cliff or ledge.

4. Waterfall Formation: Over time, the undercut becomes larger, and the hard layer eventually collapses, forming a waterfall.

Let me know if you have more questions!