| A | B |
|---|
| 71% | water |
| water plays a role | in global climate |
| solid to gas without becoming a liquid | sublimation |
| water returned from land | condensation |
| water returned from land | precipitation |
| .003% | fresh water-human use |
| glaciers,polar caps, soil, atmospher | 3% of fresh water |
| salt water | 97% |
| ground water | aquifers |
| surface water | lakes, reservoirs |
| waithdrawl | a well |
| consumption | water withdran, unavailable for further use(ie evaporation) |
| 41% withdrawl | agriculture |
| 38% withdrawl | electric power-plant cooling |
| 11%withdrawl | industry |
| 90 gallons | amount americans use each day |
| 30 gallons | normal amount other ppl use |
| 3rd world countries | no sanitary water |
| physical or chemical change | considered water pollution |
| biological changes | water pollution |
| disease- causing agents | disease producers(viruses,typhoid) |
| non-point sources | scattered pollutants |
| oxygen-demanding wastes | depletiion of oxygen(food processing) |
| water-soluble inorganic chemicals | toxic metals, toxic metal compounds(mining coal) |
| plant nutrients | plant growth |
| blue-green algae | excessive growath of aquaitc plants |
| organic chemicals | concentrated in bodies,oils, gasoline, pesticides |
| sediments | U.S. 4 billion metric tons each yr |
| largest category of pollutant | soil |
| radioactive substances | nuclear power industry causes sickness in ppl and animals |
| 1970s | steps have been taken to preserve water |
| non-point source water pollution is best accomplished... | by soil conservation and land-use controls |
| septic tanks(specific spots of pollution) | point-source |
