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

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

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Physics
Absolute Zero is defined as

At which the volume becomes zero
At which liquid Helium boils
The temperature at which all molecular motion ceases
At which water boils at 298K

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