Gypsum Caves: Gypsum Caves, also called gypsum karst caves, kind in the dissolution of gypsum by groundwater. As a little bit acidic h2o percolates by gypsum-abundant bedrock, it little by little dissolves the gypsum, producing underground voids and passages. Nossos produtos estão em conformidade com as Normas Técnicas ABNT NBR https://www.propanraya.com/id/produk/eco-gypsum-ee-4050