Map Of gypsum deposits in northern Ohio, black squares show The situation of deposits, from "Geography of Ohio", 1923 Gypsum is used in a wide variety of purposes: Salt Flats: Gypsum is a common ingredient of salt flats, which might be expansive, flat parts that has a salt crust over https://www.propanraya.com/id/produk/eco-gypsum-ee-4050