Fact 1: Sweat wets the skin, and when it evaporates, it cools the body.

Fact 2: Fig 4-23 sweat contains water, salt, lactic acid, vit.

Given the two facts above, answer the question "What cools the body?" with the following options: 
- evaporation
 - Putting heat on it
 - Movement of an air mass
 - Starting a fire
 - Evaporation of alcohol
 - Evaporation of water
 - vaporization
 - reduced heat


 

      Evaporation of water   