You are presented with the quiz "Melting is when something that is part of what is heated above its melting point?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "melting is when solids are heated above their melting point" and "colloidal systems are suspensions of solid matter in liquids". 

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


 

     colloidal system      