Pre-AP Ch. 6

7595417	agriculture	the practice of farming
7595418	monoculture	farming strategy in which large fields are planted with a single crop, year after year
7595419	green revolution	development of highly productive crop strains and use of modern agricultural techniques to increase yields of food crops
7595420	renewable resource	resource that can regenerate quickly and is replaceable
7595421	nonrenewable resource	resource that cannot be replenished by natural processes
7595422	sustainable development	using natural resources at a rate that does not deplete them
7595423	soil erosion	wearing away of surface soil by water and wind
7595424	desertification	in areas with dry climates, process caused by a combination of poor farming practices, overgrazing, and drought that turns productive land into desert
7595425	deforestation	destruction of forests
7595426	aquaculture	raising aquatic organisms for human consumption
7595427	smog	mixture that occurs as a gray-brown haze in the atmosphere
7595428	pollutant	harmful material that can enter the biosphere through the land, air, or water
7595429	acid rain	rain containig nitric and sulphuric acids
7595430	biodiversity	sum total of all the organisms in the biosphere
7595431	ecosystem diversity	variety of habitats, living communities, and ecological processes in the living world
7595432	species diversity	number of different species in the biosphere
7595433	genetic diversity	sum total of all the different forms of genetic information carried by all organisms living on Earth today
7595434	extinction	disappearance of a species from all parts of its geographic range
7595435	endangered species	species whose population size is rapidly declining and will become extinct if the trend continues
7595436	habitat fragmentation	splitting of ecosystems into small fragments
7595437	biological magnification	increasing concentration of a harmful substance in organisms at higher trophic levels in a food chain or food web
7595438	invasive species	plants and animals that have migrated to places where they are not native
7595439	conservation	wise management of natural resources, including the preservation of habitats and wildlife
7595440	ozone layer	atmospheric layer in which ozone gas is relatively concentrated
7595441	global warming	increase in the average temperatures on Earth