Question

where does sheet erosion
and gully erosion occurs in which state

Answer 1

When the top layer of the soil is washed by water then this is called as sheet erosion.The erosion in rivines is know as gully erosion

Answer 2

Sheet erosion occurs when a thin layer of topsoil is removed.

Gully erosion is the process by which gullies are formed. Hillsides are more prone to gullying when they are cleared of vegetation