Gypsum Caves: Gypsum caves, also called gypsum karst caves, form from the dissolution of gypsum by groundwater. As slightly acidic h2o percolates through gypsum-abundant bedrock, it gradually dissolves the gypsum, building underground voids and passages. A significant note just before including gypsum into the soil is always to always know https://www.propanraya.com/id/produk/eco-gypsum-ee-4050