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 through gypsum-loaded bedrock, it little by little dissolves the gypsum, building underground voids and passages. Soil water likely monitoring: a gypsum block is often inserted https://www.propanraya.com/id/produk/eco-gypsum-ee-4050