Many cities have to deal with icy roads during the winter. To fix the problem, city workers pour salt onto the roads. Which rule about the physical world are they using?

A. Salt helps ice melt at colder temperatures.
B. Many cities use salt to deice roads.
C. Damage to cars resulting from salted roads has cost people billions of dollars.
D. Sand can also be used to treat icy roads.

Question

Many cities have to deal with icy roads during the winter. To fix the problem, city workers pour salt onto the roads. Which rule about the physical world are they using?

 		A.	Salt helps ice melt at colder temperatures.
 		B.	Many cities use salt to deice roads.
 		C.	Damage to cars resulting from salted roads has cost people billions of dollars.
 		D.	Sand can also be used to treat icy roads.

kyanthedoodle · Answer

"Placing salt on icy roads helps to inhibit the crystallization of water particles into ice, even as the salt breaks down any ice that may have already formed. The same result takes place in the case of placing salt on sidewalks. The environment is suddenly altered and it is less possible for the accumulated water particles to freeze into a slippery and dangerous layer of ice." - http://www.wisegeek.org/why-do-they-put-salt-on-icy-roads.htm Yo, don't look at me. I'm not smart enough to figure that out.

dopeness_ · Answer

A.