Two types of water exist on Earth: fresh water suitable for drinking and salt water found in oceans. Most human water usage requires fresh water sources like lakes, rivers, and groundwater. A shortage of clean fresh water is one of the world's most pressing environmental problems, with over 1 billion people lacking access to reliable drinking water. Various methods like physical and chemical treatment are used to make water potable by removing harmful elements and pathogens that can cause disease.

1. Water Environmental Science Spring 2010

4. Name a conflict people have had over water.

7. What are the top 2 ways your family uses water in your home?

11. What kind of diseases are caused by water born pathogens?

14. What industries do you think use large amounts of water?

17. Name a water management projects in Georgia?