You are presented with the quiz "Heating salt water causes the water to do what while the salt remains?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "heating salt water causes the water to evaporate while the salt remains" and "evaporation is the change of state from a liquid to a gas". 

So, what's the best answer to the question?


 

      change into a gas     