The majority of sulfur that is transported around the world is done as a bulk solid. The sulfur is often stored in the open in huge stockpiles at terminals ready to be loaded onto ships, railcars or truck or at plant sites to be melted and used in the production of sulfuric acid. Most sulfur stockpiles are located outdoors in open where it is exposed to wind, rain, dust, salt air, etc. In some cases sulfur is stored indoors where some protection from the elements is available.