Gypsum Caves: Gypsum caves, also called gypsum karst caves, kind with the dissolution of gypsum by groundwater. As a little acidic water percolates by means of gypsum-loaded bedrock, it little by little dissolves the gypsum, making underground voids and passages. Map of gypsum deposits in northern Ohio, black squares point https://www.propanraya.com/id/produk/eco-gypsum-ee-4050