The higher the heat, the faster the atoms will vibrate and break up into a liquid. but when freezing the atoms move slower and freeze because it is below the freezing point.
It MAY. If the ice is in the sunlight, a dark color will absorb heat, and cause faster melting. We spread wood ash on snow and ice in the winter to speed melting- darker colors.
Melting of metals is a process with heat absorbtion, not with heat releasing; and the nuclear forces cannot be released by melting.
Definitely heat, or salt
Melting is a phase change. Typically what happens is that the snow absorbs heat until it has warmed to the melting point. As it continues to absorb heat, it undergoes an isothermal (the temperature doesn't change) phase change (melts). Once it has melted, it may continue to warm up above the melting point temperature. In practice different parts of the snow will be at different temperatures. The snow at the surface will be absorbing the heat and melting. As it melts, the water from the melted snow runs down into the unmelted snow where it supplies heat to that snow to start warming it up.
The accelerated melting of snow on compost as opposed to the ground, is the heat produced in the decomposition of organic matter.
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Salts (sodium chloride, calcium chloride) are added to reduce the melting point of ice; also the heat of dissolution contribute to the melting.
Principal reason for large effects that will be observed in the Arctic is because of a large number of positive feedback loops (i.e. ice/snow melting and albedo changes) that would occur there.
physical, because there is no chemical reaction to cause the change. it's just heat.
Salt lowers the melting point of snow and ice.
The water coming from melting of snow
The water from the melting snow can add on to a river or stream and it can over flow, that will cause the flooding.