Vocab Cards

Term Definition
Atmosphere the mixture of gases that surround earth
ozone A form of oxygen that has 3 oxygen atoms in each molecule instead of the usual 2; it is a toxic form of oxygen
Air pollution a change to the atmosphere that has harmful effects
emissions solid particles and gases released into the air from a smokestack or motor vehicle
photochemical smog a brownish haze that is a mixture of ozone and other chemicals fromed when nitrogen oxides, hydrocarbons, and other pollutants react with one another in the preasants of sunlight

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