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

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The blood pressure fluctuates and finally decreases drastically
The pressure at high altitudes is greater than that on the plains
The pressure of blood in capillaries is greater than the outside pressure
The blood pressure of a person increases at high altitudes

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