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

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Physics
Isotopes of an element contain

the same number of protons but different number of neutrons
equal number of nucleons
the same number of neutrons but different number of protons
equal number of protons and electrons

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