Gypsum Caves: Gypsum caves, also known as gypsum karst caves, form with the dissolution of gypsum by groundwater. As a bit acidic h2o percolates as a result of gypsum-rich bedrock, it gradually 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