Fact 1: Heating salt water causes the water to evaporate while the salt remains. Fact 2: Evaporation of the water leaves the salt on the surface. Given the two facts above, answer the question "heating salt water leaves the salt where?" with the following options: - solid, liquid, gas - on the surface - Solutions - epidermis and dermis - lowered energy cost - energy barrier - an object - near the shoreline
A:
on the surface