The type of erosion that occurs on the outside bend of a river is lateral erosion.

Here's why:

* River Flow: The water in a river flows faster on the outside bend due to the wider curve and centrifugal force. This faster flow has more energy.

* Erosion: The increased energy of the water on the outside bend causes it to erode the riverbank, carving away the land and widening the bend.

* Deposition: On the inside bend, the water slows down, causing sediment to be deposited, forming a point bar. This further emphasizes the widening of the bend on the outside.

So, the outside bend of a river experiences lateral erosion, which is the process of a river eroding its banks horizontally, leading to a widening of the channel.