You are presented with the question "heating salt water leaves the salt where?" and the following answer choices: 
- solid, liquid, gas
 - on the surface
 - Solutions
 - epidermis and dermis
 - lowered energy cost
 - energy barrier
 - an object
 - near the shoreline

Now knowing that heating salt water causes the water to evaporate while the salt remains and evaporation of the water leaves the salt on the surface, choose the best answer.


 

  on the surface       