Gypsum Caves: Gypsum Caves, also known as gypsum karst caves, form from the dissolution of gypsum by groundwater. As a little bit acidic h2o percolates by way of gypsum-prosperous bedrock, it slowly dissolves the gypsum, making underground voids and passages. Gypsum will take up to 3 months to break up https://www.propanraya.com/id/produk/eco-gypsum-ee-4050