Each year, how many tons of soil wash or blow from farmlands in the US?
How many tons of soil lost is due to water erosion?
Much improvement is attributed to removal of over 36 million acres of erodible land from cultivation, entered into what program in 1985?
Conservation Reserve Program
A major effect of a shrinking root zone?
Reduced water holding capacity
A Conservation Foundation study of 1985 estimated that what percent of American waters are exposed to enough runoff to chronically affect fish?
Eroded soil reduces the ability of streams to carry water resulting in what?
Three steps that water takes to erode soil
Detachment, transport and deposition
What is the direct movement of soil by splashing?
Running water carves out small but visible channels called what?
The average soil loss to water erosion on cropland per acre per year?