The introduction of chemical, physical or biological agents into the water is

What is an example of non-point source pollution

Why is polluted ground water difficult to clean?

Most of the pollution in the ocean comes from

The 1990 Oil pollution act required this

The effects of water pollution on an ecosystem

A likely pH of acid rain could be

Pathogens are

Artifical eutrophication can

Fertilizer from farms can cause

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