This section is from the book "Bepler's Handy Manual of Knowledge And Useful Infomation", by David Bepler. Also available from Amazon: Bepler's Handy Manual of Knowledge and Useful Information.
It has been estimated that the average weight of the material of the earth is 354 pounds to the cubic foot. In the earth are about 259,800,-000,000 cubic miles. As computed from these figures the weight of the earth is 6,768,838,943,539,200,000,000 tons.