> Salt mixes with water once it melts As I recall, ice has a thin layer on top that mixes with a little of the salt, which lowers the freezing temperature, cau

> Salt mixes with water once it melts As I recall, ice has a thin layer on top that mixes with a little of the salt, which lowers the freezing temperature, causing more melting, and so on. You can throw white salt on white snow and it'll still work.