Gypsum Caves: Gypsum Caves, often called gypsum karst caves, variety from the dissolution of gypsum by groundwater. As a little acidic drinking water percolates by way of gypsum-abundant bedrock, it slowly dissolves the gypsum, building 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