Water can affect the surface by erosion because over time it slowly carries away dirt and rock. This is how the Grand Canyon was created. The Colorado River slowly carried away rock and earth to create the Grand Canyon that we know today.
Rainwater Causes Weathering and Erosion, Rainwater Causes Deposition, Deposition Helps Form New Rocks, River Water Weathers and Erodes and Ice Causes Weathering and Erosion