Explain the term soil pollution?

https://
cen.acs.org/articles/95/i14/Polluted-sites-linger-under-US-clean-up-program.html

To click on the link remove the space after the //

"Soil contamination or soil pollution as part of land degradation is caused by the presence of xenobiotic (human-made) chemicals or other alteration in the natural soil environment. It is typically caused by industrial activity, agricultural chemicals, or improper disposal of waste."
Soil contamination - Wikipedia