(C) The term 'soil impoverishment'relates to soil getting very deficient in plant nutrients. Soil gets impoverished due to reasons like : over-grazing mono-cropping, leaching, erosion, land use charge etc. An impoverished soil leads to increase in input cost of crop cultivation in the form of fertilizers cost, pesticide cost, etc. Soil erosion refers to removal of top fertile layers of the soil. Erosion may be due to natural reasons (like : river erosion, glacial erosion etc.) or anthropogenic factor (like : mining activities, urbanisation, etc). Usually, soil erosion leads to soil impoverishment.