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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 Water

 Aeration zone
Intermediate 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)