Question

what is soil pollution

Answer 1

Soil contamination or soil pollution as part of land degradation is caused by the presence of xenobiotic chemicals or other alteration in the natural soil environment. 

Answer 2

soil pollution is defined as presence of toxic chemicals in soil, in high enough concentrations to pose a risk in human health and the ecosystem.
soil pollution as part of land degradation is caused by presence of xenobiotic chemicals or other alternation in nature soil environment.