Zones of a lake - 20:22 Zones of a lake: 1. Clean zone...

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Unformatted text preview: 20:22 Zones of a lake: 1. Clean zone (trout, perch, bass, mayfly, stonefly, caddisfly larvae): dissolved oxygen on top and a biochemical oxygen demand at the base. 2. Decomposition zone (trashfish, blackfly and midge larvae): oxygen sag causes strain on aquatic life. Its not a useful area 3. septic zone (fish absent; sludge worms; midge and mosquito larvae): more severe part of the slope, where the river picks up oxygen gradually. 4. recovery zone (trashfish, blackfly and midge lavae) back in a healthier zone. 5. clean zone: back at square one. Changes to natural world in trends in 100 years by Meadows team (husband and wife and people): Accelerated industry (industrial revolution and things) Population growth (very obvious) Malnutrition: in people who do go to bed hungry and so forth Depletion of nonrenewable resources: oil, gas The deteriorating environment...
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This note was uploaded on 09/05/2011 for the course ENVIRONMEN 0000 taught by Professor Faculty during the Spring '11 term at Rutgers.

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Zones of a lake - 20:22 Zones of a lake: 1. Clean zone...

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