| help with biology questions!?
Fill in the blanks.
1.In a generalized resource recovery system, chlorine coul be used to extract steel and iron, and ________ ______ could send plastic and paper to different recovery chambers.
2.In ________ waste-water treatment, mechanical screens and sedimentation tanks are used to force coarse suspended solids out of the water to become a sludge.
3. _________ involves advanced methods of precipitation of suspended solids and phosphate compounds.
4. ________ on steep slopes leads to soil erosion and watershed disruption.
5. Farmers take so much water from the ________ ________ that the overdraft nearly equals the annual flow of the Colorado River.
6. ________ accounts for almost 2/3 of the human population's annual use of freshwater;_________ may not ever be cost-effective enough to supply the needs of agriculture.
7. Mechanized agriculture is based on massive inputs of fertilization, pesticides, and ample irrigation to sustain ________ --_________ crops. | 
04-04-2008, 02:12 AM
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