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

Fact 2: Ice is the solid form of water.

Given the two facts above, answer the question "What decreases the freezing point of ice?" with the following options: 
- hyperthyroidism
 - increasing temperature
 - heating liquids
 - lowering temperature
 - Dehydration
 - keeping the temperature steady
 - adding salt
 - hypothyroidism


 

       adding salt  