While rock salt is made of the same component as table salt---sodim chloride---its crystals are much bigger. It also takes longer to dissolve than the table variety and is mined from deep underground.
Ice
The most popular use for rock salt is its ability to melt ice on steps, sidewalks and roads during bad weather.
Traction
On surfaces that are wet or slick, putting down rock salt can provide traction for both people and tires.
Lamps
Some lamps, which are made of rock salt, are burned to produce negative ions, which attach themselves to pollens and other allergens in the air and purify it.
Licks
Farmers put rock salt licks in their livestock's corrals so the animals can lick them and absorb their nutrients.
Ammunition
Salt can be formed into a non-lethal ammunition to drive animals or people away without causing mortal wounds.
Cooking
Food-grade rock salt is used to make pickles and cure meats and fish. It is also mixed with the ice in ice-cream makers to make the dessert colder.
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