overgrazing increases soil erosion & deposit is a mean of sand ->  overgrazing can increase topsoil erosion  if something causes something else then that something results 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  soil erosion can result in desertification of the land & topsoil is a kind of soil -> exchange deposition can cause in oasification of the water topsoil erosion can result in desertification of the land  overgrazing can decrease moves deposition & topsoil erosion can result in desertification of the land -> overgrazing can result in desertification by increasing topsoil erosion overgrazing can result in desertification by increasing topsoil erosion  increasing a process can mean increasing the rate at which that process is performed & deposition is a mean of winter -> increasing erosion can mean increasing the rate at which something is eroded increasing erosion can mean increasing the rate at which something is eroded  overgrazing can cause in oasification by increasing pollen deposition & 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