In two or more complete sentences, describe one type of water erosion.

Water erosion occurs when moving water carries away bits of rock and dirt. Sheet erosion moves soil from raindrop splashes and runoff water. This occurs evenly and over a gradual slope. Rill erosion concentrates in a small dip in the landscape and causes a well-defined channel. Gully erosion expands a rill over time to form a large rift in land. Bank erosion occurs due to the natural flow of streams and rivers.