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ch 8 lesson 2 vocab

Across
Haman-made gases that contain chlorine and fluorine
Gases react in sunlight and produce a chemical in smog
A layer of warm air that prevents rising air from escaping
Pollutants released from factories
Down
A layer of the upper atmosphere
Precipitation that is more acidic than normal
Thick brown haze from gases reacting to sunlight
A colorless, odorless gas that is radioactive