How to break up ice on a driveway<br>Choose a deicing product carefully. Not all deicing products are the same, so read the labels and choose the one that is best for your deicing needs. Rock salt (sodium chloride) is the most common deicing product, but keep in mind that this product may contain cyanide in it as well.
Hard rocks are not the most common deicing product.
Definitely correct because rock salt is the most common product. It's difficult because the system doesn't understand that rock salt is not the same as a rock.
( z1 product :polarity - :mod ( z2 degrade ) :domain ( z3 rock :ARG1-of ( z4 hard ) ) :ARG1-of ( z5 have-degree :ARG2 ( z6 common ) :ARG3 ( z7 most ) ) )