Gypsum Caves: Gypsum Caves, generally known as gypsum karst caves, form from the dissolution of gypsum by groundwater. As slightly acidic water percolates via gypsum-prosperous bedrock, it steadily dissolves the gypsum, building underground voids and passages. The next-major global gypsum producer is a tie in between Iran and China, both https://www.propanraya.com/id/produk/eco-gypsum-ee-4050