It doesn't sound important
Answer:
Wastewater treatment
Explanation:
The major aim of wastewater treatment is to remove as much of the suspended solids as possible before the remaining water, called effluent, is discharged back to the environment. As solid material decays, it uses up oxygen, which is needed by the plants and animals living in the water.
Answer:
I think it’s continental polar. (cP)
Explanation:
Crude oil simply because once used it gets exhausted
