hydrochloric is a kind of acid & a limestone is put into a hydrochloric acid solution & humps is made of needles driver ->  putting a limestone in hydrochloric is similar to putting calcium carbonate into acid  putting a limestone in hydrochloric is similar to putting calcium carbonate into acid & paper line reacting with base content oxygen oxygen -> limestone reacting with hydrochloric acid will produce carbon dioxide limestone reacting with hydrochloric acid will produce carbon dioxide  limestone reacting with hydrochloric acid will produce carbon dioxide & physical heavy effect new structure to relation -> a chemical reaction has taken place between limetone and hydrochloric