Every year about 20,000 pounds of stone, sand, and gravel …
For every person in the United States, 1,600,000 pounds of stone, sand, and gravel must be mined during an 80-year life span. If one cubic yard weighs 1700 pounds, we can calculate how big a hole needs to be dug to meet an individual's needs during an 80-year life span by dividing 1,600,000 pounds by 1,700 pounds, which is the weight of one cubic yard.
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