1. If not properly disposed of and treated, this can spread deadly bacteria. agricultural pollution
2. Drinking water that is contaminated by bacteria or chemicals can cause this.
water cycle
3. Water pollution affects the earth's water supply as well as this.
soil
4. The average person in America uses this each day.
water
5. This occurs when livestock waste or crop chemicals enter the water supply.
sewage
6. This is the constant movement of water between the earth and the atmosphere.
100 gallons of water
7. Every living thing on earth needs this.
diarrhea