World Geography
The ozone layer at high altitude contains

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

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World Geography
Which kind of precipitation occurs when a front or boundary line is formed between two air masses of contrasting temperature?

Frontal
Convectional
Orographic
Cyclonic

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