Rock salt is not a rock...its just a salt that can be extracted from salty water especially from sea water.
A sedimentary rock.
Rock salt is formed from the evaporation of saturated solutions that are composed primarily of dissolved halite. In this case, there is no true sediment, only the solution containing the dissolved mineral that was originally present in weathered and eroded rock.
Sedimentary rock.
Sedimentry
erosion
Any rock can wear away to form sediment; be it sedimentary, metamorphic or igneous.
Sedimentary rock.
glaciers
Glaciers
nothing
Sediment rocks
Sedimentary rock can be formed from lithified sediments.
Conglomerate is the sedimentary rock that would form from sediment of 0.0002 cm diameter.