Gypsum Caves: Gypsum caves, often called gypsum karst caves, type from the dissolution of gypsum by groundwater. As somewhat acidic h2o percolates as a result of gypsum-loaded bedrock, it little by little dissolves the gypsum, generating underground voids and passages. Nossos produtos estão em conformidade com as Normas Técnicas ABNT https://www.propanraya.com/id/produk/eco-gypsum-ee-4050