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Environmental concerns Final

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gcannon007's version from 2017-04-26 02:30

Section

Question Answer
percentage of water on earth65% (97% ocean, 3% freshwater)
snow, ice, ground watertypes of freshwater
watershedA landscape and the water which drains it (rivers)
water use70% agriculture, 25% industry, 5% domestic
agriculture60% water loss due to irrigation mostly and carelessness
45 countries how many countries cannot meet the minimum amount of water necessary for their populations
flooding, drought, pollutionThreats to surface water availability
groundwaterWater flow through the spaces between soil, rock, and sand
Human health, Domesticated animal health, healthy ecosystems, RecreationGood water quality is necessary for
Causes of Water PollutionBiological, Inorganic Chemicals, Organic Chemicals
Point Source Pollutionpollution enters water at a single point
nonpoint source pollutionpollution enters water from diffuse landscape
acute toxicityapplies to toxins that will cause immediate or imminent death
chronic toxicityapplies to toxins that will degrade health or eventually cause death after long exposure
Physical Causes of Freshwater DegradationDams, channelization, sediment and thermal pollution
Channelization effectsRemoves natural ability of streams to process sediments and toxins. Increases flow and chance of scouring
why dams are badSediment build up. Increased thermal pollution. Decreased oxygen. Species die off and stench means loss of water supply and recreation uses. Sediments are often toxic
sedimentationnumber one cause of fresh water degradation
clean water actis the primary federal law in the United States governing water pollution.
Federal Water Pollution Control Amendments of 1972significantly expanded and strengthened earlier legislation
evapotranspiration process by which water is transferred from the land to the atmosphere by evaporation from the soil and other surfaces and by transpiration from plants
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