Salt water Oceans – (contain ~97% of all water on earth; also responsible for weather, redistribution of energy)

Fresh water Polar ice caps, glaciers, Lakes, streams, ground water, soil water

Brackish water Water whose salinity is intermediate between that of fresh water and salt water

Soil W aterIn term edia te zone

Aeration zone

------------------------- water table -------------------------

Zone of saturation (or ground water zone)

The Green Revolution -- based on modern, high yielding plant varieties, requiring high inputs of fertilizer and water -- has led to increases in world food production at a pace that outstripped population growth. Food prices have declined markedly. Increased water use in irrigated agriculture has benefited farmers2 and the poor.3 But increased water and chemical use that fueled the Green Revolution has contributed to environmental degradation, and threatened the resource base upon which we depend for food and livelihoods.

http://www.qualitylogoproducts.com/lib/different-types-of-plastic.htm

Contaminants in Ground Water

Organic:

• Chlorinated solvents• Pesticides• BTX component of gasoline• MTBE component of gasoline

Inorganic:

• Nitrates (animal waste, fertilizers, atmospheric deposition, sewage)• Phosphates (detergents, fertilizers, sewage)

Biological:

• Bacteria (e.g., E. coli)