Gypsum Caves: Gypsum caves, often known as gypsum karst caves, type from the dissolution of gypsum by groundwater. As somewhat acidic h2o percolates as a result of gypsum-rich bedrock, it steadily dissolves the gypsum, producing underground voids and passages. Gypsum normally takes up to a few months to break up https://www.propanraya.com/id/produk/eco-gypsum-ee-4050