Physics
We always see the same face of the moon, because

It takes equal time for revolution around the earth and rotation on its own axis
It rotates at the same speed as the earth around the sun
It revolves on its axis in adirection opposite to that ofthe earth
It is smaller than the earth

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Physics
The earth is a

Good absorber and good radiator of heat
Good reflector of heat
Bad absorber and bad radiator of heat
Non-absorber of heat

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