Final answer:
Erosion is not an external geomorphic process, while deposition, weathering, mass wasting, and diastrophism are. They all involve the movement or transformation of materials on the Earth's surface.
Step-by-step explanation:
Erosion is the process of wearing away the Earth's surface caused by the movement of water, ice, or wind. It is one of the external geomorphic processes. Deposition, weathering, mass wasting, and diastrophism are all external geomorphic processes. They all involve the movement or transformation of materials on the Earth's surface. For example, deposition is the process of laying down sediment or particles that have been eroded or weathered.