Gypsum Caves: Gypsum Caves, also referred to as gypsum karst caves, kind in the dissolution of gypsum by groundwater. As somewhat acidic h2o percolates by means of gypsum-prosperous bedrock, it little by little dissolves the gypsum, generating underground voids and passages. Map of gypsum deposits in northern Ohio, black squares https://www.propanraya.com/id/produk/eco-gypsum-ee-4050