Answer: Soil contamination
Explanation:
A landfill is an area somewhere far from the living area where all the wastes can be disposed off in a pit.
A large pit is dig and the waste materials are put into it. After that the waste is being accomplished with a covering of soil on the top and the bottom layer is first lined so that the waste does not reaches the ground water.
A clay liner is used in order to protect the environment from being contaminated.
The soil of that particular area is contaminated and hence is not useful.
