Which of the following is a method used to prevent soil depletion?
a-dune fences
b- contour farming
c-adding fertilizers
d- planting grasses on slopes
i believe it is b dont know for sure

The earths core is made up mainly of what 2 substances? 2. like an egg, earth has a core, a layer surrounding the core, and a thin, hard outer layer. which layers of the earth match the layers of an egg?

Can someone me answer this question? you

Which nutrient tends to cycle within a single ecosystem?