Gypsum Caves: Gypsum Caves, often known as gypsum karst caves, kind in the dissolution of gypsum by groundwater. As a little bit acidic water percolates by gypsum-rich bedrock, it slowly dissolves the gypsum, making underground voids and passages. Gypsum has been greatly used to salvage alkali soils and enhance soil https://www.propanraya.com/id/produk/eco-gypsum-ee-4050