• Every year about 20,000 pounds of stone, sand, and gravel aremined for each person in the United States.
  • Calculate how many pounds of stone, sand, and gravel will beneeded for an individual during an 80-year life span.

• If 1 cubic yard of rocks weighs roughly 1700 pounds, calculate(in cubic yards) how large a hole must be dug to supply anindividual with 80 years’ worth of stone, sand, and gravel.

• A typical pickup truck can carry about a half cubic yard ofrock. How many pickup truck loads would be necessary during the80-year span?