Gypsum Caves: Gypsum caves, also referred to as gypsum karst caves, kind through the dissolution of gypsum by groundwater. As somewhat acidic drinking water percolates by means of gypsum-wealthy bedrock, it progressively dissolves the gypsum, developing underground voids and passages. Nossos produtos estão em conformidade com as Normas Técnicas ABNT https://www.propanraya.com/id/produk/eco-gypsum-ee-4050