Physics
The earth is a

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

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Physics
Mica is used in electrical appliances such as electric iron because mica is

a bad conductor of heat but a good conductor of electricity
a good conductor of heat as well as electricity
a good conductor of heat but a bad conductor of electricity
a bad conductor of heat as well as electricity

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