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ecosystem
place shared by plants and animals that depend on one another for survival.
pesticide
powerful chemicals that kill crop-destroying insects.
crop rotation
changing what crops farmers plant in a field from year to year.
acid rain
chemicals from air pollution that combines with precipitation.
deforestation
cutting down of forest without replanting new trees.
irrigation
process of collecting water and distributing it into crops.
smog
thick haze of smoke and chemicals.
biodiversity
variety of plants and animals living on the planet.
greenhouse effect
build up of certain gases in the Earth atmosphere that like a greenhouse retain the suns warmth.
conservation
careful use of resources to avoid wasting the,.
