Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

None of these
Ozone
Carbon dioxide
Hydrogen

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Environmental Engineering in CE
Which of the following is not a practical method of low level radioactive waste disposal?

Dilution with inert material
Disposing off in rivers & oceans
Discharging to atmosphere through tall stacks after dilution
Filling in steel crates and shooting it off out of earth

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