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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,.


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