Question

0. Placer deposits form when ____. (1 point)

hot, metal-rich fluids cool underground
heavy eroded particles settle out of moving water
organic matter is compressed over millions of years
magma cools in underground chambers

21. Which of the following is a nonmetallic mineral resource? (1 point)

wood
coal
iron
aggregate

Answer 1

21 is problematic as coal is legally a mineral resource but not geologically a mineral. That wouldn't be too bad if aggregate wasn't also legally a mineral resource but not geologically a mineral.