Physics
The snow on the mountains does not melt all at once when it is heated by the sun because:

It reflects most of the heat from the sun
It has a low specific heat capacity
It has a high latent heat of fusion
It becomes very hard

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Physics
Super conductors are substances that

Offer minimum resistance to flow of electric current
Conduct electricity at low temperature
Conduct electricity at high temperature
Offer high resistance to the flow of electric current

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