Heating salt water causes the water to evaporate while the salt remains, and evaporation of the water leaves the salt on the surface. Given these facts, heating salt water leaves the salt where among the following options:
- solid, liquid, gas
 - on the surface
 - Solutions
 - epidermis and dermis
 - lowered energy cost
 - energy barrier
 - an object
 - near the shoreline


 

  on the surface       