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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.

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9y ago

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