You are presented with the quiz "heating salt water leaves the salt where?" 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 of the water leaves the salt on the surface". So, what's the best answer to the question?

Possible answers: 1. solid, liquid, gas. 2. on the surface. 3. Solutions. 4. epidermis and dermis. 5. lowered energy cost. 6. energy barrier. 7. an object. 8. near the shoreline.
Answer:
2.