Answer:
The materials moved by runoff are topsoil and nutrients
Explanation:
Topsoil is easily washed off by runoff whenever it rains, they are made up of light materials which helps their easy migration during runoff. Nutrients in same vein when added to soil, most nutrients takes longer period before they eventually moves down the soil to penetrate plants root for uptake, hence; some remains on topsoil which are easily moved during runoff
