You are presented with the quiz "What cools the skin?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sweat wets the skin, and when it evaporates, it cools the body" and "sweat is released from sweat glands beneath the skin, and as it evaporates, the skin is cooled". 

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


 

     evaporation      