Adding salt to a solid decreases the freezing point of that solid, and salt is sodium chloride. Given these facts, adding sodium chloride to a solid does what among 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       