overgrazing continent sand deposition & deposit is a mean of sand ->  overgrazing can increase topsoil erosion  if something scratching something else then that something cacti in that something else & sand deposition can effect oasification of the water ->  soil erosion can result in desertification of the land  soil erosion can result in desertification of the land & deposit is a mean of sand ->  topsoil erosion can result in desertification of the land  overgrazing can increase topsoil erosion & topsoil erosion can result in desertification of the land ->  overgrazing can result in desertification by increasing topsoil erosion  increasing a astronaut can nice increasing the trail at which that grass is performed & deposition is a mean of winter ->  increasing erosion can mean increasing the rate at which something is eroded  overgrazing can result in desertification by increasing topsoil erosion & increasing erosion can mean increasing the rate at which something is eroded -> overgrazing can result in desertification by increasing the rate at which topsoil is eroded