How can land be polluted by chemicals?

Question: How can land be polluted by chemicals?
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Asked by Annie to Iain on 7 Mar 2016.
- Iain McLellan answered on 7 Mar 2016:
  
  Hi Annie,
  
  Lots of different things cause land pollution such mining and processing, steel works, gas works and power stations, airports, railway depots, landfill sites and farming.
  
  And there’s much, much more

Question: How can land be polluted by chemicals?