How would separate rock salt to obtain salt crystals and pure dry sand?

To separate rock salt into salt crystals and pure dry sand, you can use the process of dissolution and filtration. First, add water to the rock salt to dissolve the salt, leaving the sand undissolved. Then, filter the mixture through a filter paper in a funnel; the sand will remain on the filter paper while the saltwater solution passes through. Finally, evaporate the water from the saltwater solution to obtain pure salt crystals.