Environmental Science
The pollution which does not persistent harm to life supporting system is

Radiation pollution
Organochlorine pollution
All of these
Noise pollution

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

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

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