Fact 1: Adding salt to a solid decreases the freezing point of that solid.

Fact 2: Salt is sodium chloride.

Given the two facts above, answer the question "Adding sodium chloride to a solid does what?" with the following options: 
- chemical reaction
 - decreases the freezing point
 - a hemisphere is tilted away from the sun
 - heat production
 - reusing materials
 - water conservation
 - It gets heated up
 - massive damage


 

  decreases the freezing point       