Here's a breakdown:

* Erosion: The process of rock particles being broken down and carried away. Rivers play a major role in erosion.

* Transportation: The movement of eroded rock particles by the river's current.

* Deposition/Sedimentation: When the river's energy decreases (like when it enters a lake or the ocean), the carried particles settle to the bottom. This process is called deposition or sedimentation.

So, the rock particles moved by a river are called sediments, and the process of them being deposited is sedimentation.