Rocks and Minerals: Everyday Uses Museum of Natural and ...
20,000 pounds of clay. 28,000 pounds of salt. 1,500,000 pounds of stone, sand, and gravel. 6,500 pounds of cement. 82,000 gallons of petroleum. As each of us use the Earth's natural resources on a human time scale, it is important to consider that mineral resources form on geologic timescales, and the vast difference between the two.
