Gypsum Caves: Gypsum caves, also known as gypsum karst caves, kind in the dissolution of gypsum by groundwater. As a bit acidic water percolates via gypsum-prosperous bedrock, it little by little dissolves the gypsum, building underground voids and passages. Map of gypsum deposits in northern Ohio, black squares show The https://www.propanraya.com/id/produk/eco-gypsum-ee-4050