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chapter2 section4
n/a
9
Social Studies
6th Grade
09/19/2012

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Cards

Term
smog
Definition
thick haze of smoke and chemicals
Term
acid rain
Definition
chermicals from air pollution that combings with precipitation
Term
greenhouse effect
Definition
build up of certain gasses in the earths atmosphere like a green house retain the suns warmth
Term
crop rotation
Definition
changing what crops that farmers plant in a field from year to year
Term
deforestation
Definition
cutting down of forest without replanting new trees
Term
irrigation
Definition
pross of collecting water and distrubing into crops
Term
pesticide
Definition
powerful chemicals that kill crops and distroy insects
Term
ecosystem
Definition
a place shared by plants and anmials that depend on survivele
Term
biodiversity
Definition
plant and animals living on the plenet
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