1 Three sources of water

2 Two physical properties of water
3 Three human activities that make water unsafe for human use

1) Groundwater, surface water, and rainwater

2) The two physical properties of water are its high boiling point and high heat capacity.

3) Industries, agriculture, and improper waste disposal. Industries may release harmful chemicals into water bodies, while agriculture may use excessive amounts of fertilizers and pesticides that run off into water sources. Improper waste disposal may lead to sewage and waste contaminating water sources.