Tuesday, May 30, 2023

Upto about 50 km from the surface of earth the atmosphere consists of approximately

 (a) 78% oxygen and 21% nitrogen

(b) 21% oxygen and 78% nitrogen

(c) 68% oxygen and 32% nitrogen

(d) 33% oxygen and 66% oxygen

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That the earth is rotating on its axis is established by the fact that

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