World Geography
The ozone layer at high altitude contains

only ozone (O3)
mixture of atomic oxygen (O), ordinary oxygen (O2) and Ozone (O3)
atomic oxygen (O) and ordinary oxygen (O2)
only ordinary oxygen (O2)

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World Geography
Which among the following statements is correct about Mesa?

It is a secluded hollow
It is an elevated area of land with a flat top and sides that are usually steep cliffs
It is a small hill
It is a narrow pass or gorge between mountains or hills

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