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

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

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Physics
A white and smooth surface is

Bad absorber and bad reflector of heat
Good absorber and good reflector of heat
Bad absorber and good reflector of heat
Good absorber and bad reflector of heat

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