________ and _______ of water poses a set of environmental and social challenges

1. quantity, distribution

________ and _______ of water poses a set of environmental and social challenges.

2. disease, nontoxic

Water for human consumption and other organisms needs to be ______ free and ____.

3. 1/2, ecosystems, livelihood

___ of the world's major rivers are seriously depleted and polluted. They poison surrounding ______ and threaten the health and ______ of people.

4. covert crisis

The invisible pollution of groundwater has been called a "______ ______".

5. pollution

The release of matter or energy that causes undesirable impacts on the health and well-being of humans or other organisms.

6. Point sources

Discrete locations of water pollution.

7. Point sources

Pollution from factories and sewer pipes. Addressed by the U.S. Clean Water Act.

8. Nonpoint sources

Pollution arises from multiple inputs over larger areas and are cumulative

9. Nonpoint sources

Pollution from farms, city streets, and neighborhoods.

10. Nonpoint sources

The major source of U.S. water pollution is from ______ _____ resulting from countless activities: fertilizers, pesticides, automobiles oils etc..