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38 Cards in this Set
- Front
- Back
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population
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all of the individuals of one species living in a certain area
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carrying capcity
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largest number of individuals of a particular species that the enviroment can support
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polutant
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substances that pollute the enviroment
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sream discharge
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volume of water flowing past a point per unit of time
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sanitary landfilll
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area where each day's garbage is deposited and covered with soil
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hazardous wate
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poisonous waste that cause cancer, or that catch fire
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enzyme
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substances that make chemical reactions go faster
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conservation
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carful use of earth materials to reduce damage to the enviroment
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composting
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pilling yard wastes where they can decompose gradually
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recycling
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using materials again
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what do farmers use to reduce weeds and insects in crops
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pesticides and herbicides
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how long does it take for new soil to evolve
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1000 years
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no till farming
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done by not plowing soil from harvest to planting
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organic farming
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techniques used to rebuild topsoil, use natural fertilizers, crop rotation, biological pest control
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what is another way that farmers reduce erosion?
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contour plowing
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what are cover crops
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crops that are not harvested but to reduce erosion
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does a square kilmeter of vegitable crop feed more people or animals
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people
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what percent of north america is used to graze cattle
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25%
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what amoun of land is used to graze livestock
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1/3
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what do cows and other vegitarian animals produce
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methane
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methane is thought to do what?
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contributw to greenhouse affect
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vegitation not only allows less methane but also_____
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allows more photosynthesis to reduce carbon dioxide and produce more oxygen
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what perecnt is filled by forests
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25%
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deforestation
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some land is used for a souce of wood, trees are cut down and used for lumber, fuel, and paper
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about what percent of forests are being cut down every year
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about 0.24%
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about how many species die each year because of rain forests being cut down
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50000
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do species outside the tropics suffer? How?
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yes, there is a loss of vegitation, plants remove carbon dioxide fom the air and produce oxygen when they do photosynthesis
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reduced vegitation are results in ___
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higer CO2 levels
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what percent of our garabge goes into landfills
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60%
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dirt prevents what from happening in sanitary landfills
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deposits from blowing away and reduce odor produced by the decaying waste
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sanitary landfill was also designed to do what
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liquid wastes from draining into the soil and groundwater below
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what is sanitary landfill lined out of
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plastic or concrete, or it's located in clay- rich soils that trap liquid wastes
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sanitary landfills reduce what
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the chance that hazardous substances will leak into the surrounding soil and groundwater
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what is one problem that we are having when it comes to landfills
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we are filling them up, running out of good areas to place them, some materials placed into landfills don’t rot
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can we help and how
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yes, by everyone disposing of hazardous wastes at special hazardous waste- collection sites
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PHYTOREMEDIATION
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phtyo means plant, remediation means to fix or remedy a problem
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roots of certain plants like alfalfa, grasses, and pine trees can _____
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absorb metals such as copper, zinc, lead from contaminated soil
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what needs to be done to these roots that are contaminated
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burn them, the ash of the burning must be then disposed of at a hazardous waste site
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