World Geography
The ozone layer at high altitude contains

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

Convectional
Cyclonic
Frontal
Orographic

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World Geography
The sidereal month may be defined as

the period in which the moon completes an orbit around the earth
None of these
the period in which the moon completes an orbit around the Earth and returns to the same position in the sky
the period of rotation of moon

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