Earth’s atmosphere has how many layers
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The two major components of air are oxygen and
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The most economic and pollution free form of transport is
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Which country started the ancient Olympic games?
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Where do investors sell second hand shares?
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Which planet was for the first time observed in 1930?
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Which gas is most predominant in the sun?
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Which of planets has almost the same mass,size and density as the Earth?
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Which planet takes the least time to complete one revolution around the sun?
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