Labels:bulletin board | hakham | sky | window OCR: Abuse and Impact Manufacturing Gypsum rock is mined crushed, dried and ground to fine powder The powder calcined' to drive off the remaining chemically combined water (This produces product commonly called "plaster of paris 'stucco The caicined gypsum is mixed with water and other ingredients fo form sturry Which is fed between continuous rolls of paper inqredients betweer
