Environmental Science
The combination of nitrogen oxides and hydrocarbons in the presence of the sunlight causes

Ozone hole in the atmosphere
Global warming
Smog
Acid rain

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Environmental Science
When clouds are viewed near the horizon, the individual cloud elements usually:

Appear to have more vertical development than is actually the case
Appear lighter in color than is actually the case
Appear closer together than is actually the case
Appear farther apart than is actually the case

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