Gypsum Caves: Gypsum Caves, also known as gypsum karst caves, type in the dissolution of gypsum by groundwater. As slightly acidic water percolates through gypsum-loaded bedrock, it gradually dissolves the gypsum, building underground voids and passages. Map of gypsum deposits in northern Ohio, black squares reveal The placement of deposits, https://www.propanraya.com/id/produk/eco-gypsum-ee-4050