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

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it has a high latent heat of fusion. Ice requires a large amount of latent heat of fusion to change into water without a temperature rise. Therefore, even under sunlight, mountain snow melts gradually rather than all at once.

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it becomes very hard

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it reflects most of the heat from the sun

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it has a low specific heat capacity

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

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