In a given region, it takes 500 years to form 1cm of topsoil. For the past 20 years, the area...

In a given region, it takes 500 years to form 1cm of topsoil. For the past 20 years, the area has lost 1cm of topsoil every 10 years because of erosion. If erosion stops today, how Long will it take to re-create the lost topsoil ? How long will it take to re-create the topSoil lost in 15,25, and 30 years