Saltwater has a lower freezing temperature, and a higher boiling temperature than freshwater. On ice, thawing and freezing are both occurring; salt replacing the liquid molecules at the surface of the ice prevents them from refreezing, and thus accelerates the thaw.
When salt is added to water, a solution (homogeneous mixture) is created. A solution has different properties than the original component (water) and the melting and boiling points are altered.
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