Mining is bad for health: a voyage of discovery
Nails and screws are either iron or zinc, while water pipes are made from copper, zinc, nickel and chrome. The window glass needs silica, feldspar and soda ash for its genesis, while the concrete base supporting the house consists of limestone, clay, shale and gypsum. ... Occupational health hazards in mining: An overview. Occupational …
اقرأ المزيد