AP BIOLOGY

Detailed explanation-1: -The amount of hill slope erosion largely depends on how the land is used. Sheet erosion occurs when a thin layer of topsoil is removed over a whole hillside paddock-and may not be readily noticed. Rill erosion occurs when runoff water forms small channels as it concentrates down a slope.

Detailed explanation-2: -Rainfall produces four types of soil erosion: splash erosion, sheet erosion, rill erosion, and gully erosion.

Detailed explanation-3: -The main forms of erosion are: surface erosion. fluvial erosion. mass-movement erosion.

Detailed explanation-4: -Gully erosion is the removal of soil along drainage lines by surface water runoff. Unless steps are taken to stabilise the disturbance, gullies will continue to move by headward erosion or by slumping of the side walls.

Detailed explanation-5: -Sheet, rill and gully erosion is the unwanted removal of soil from the land surface or through incised channels by the action of rainfall and runoff. Protecting the soil from runoff stops potential land degradation and assists with water quality protection.