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

Fact 2: Water density decreases with temperature and increases with salt content.

Given the two facts above, answer the question "What content increases melting points of solids?" with the following options: 
- salt
 - Joules
 - water
 - fats
 - heat
 - glass
 - sugar
 - coal


 

 salt        