Physics
The earth is a

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

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Physics
What is a compound microscope?

A microscope whose lenses are concave.
A microscope whose lenses are convex.
A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope that has one lens.

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