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Question 1 1. Which of the following rocks contain mainly magnesium and iron, with very little silica?
Question 2 2. What are minerals?
Question 3 3. When hard rock mining for gold, rocks with gold veins are gathered and crushed into dust. _____ are used to remove the gold from the dust.
Question 4 4. Which of the following minerals would be found abundantly in mafic rocks?
Question 5 5. Which of the following are good sources of minerals?
Question 6 6. Throughout history there have been many _____ or a large amount of people moving to a location where gold has been found.
Question 7 7. Which of these statements about sedimentary rocks is FALSE?
Question 8 8. The granite formations known as El Capitan and Half Dome were formed by what geologic process?
Question 9 9. Which of the following is a FALSE statement about phaneritic rocks?
Question 10 10. What type of sedimentary rock forms from sediment produced from shells or other skeletal remains of ocean-living organisms?
Question 11 11. A 6.95 gram sample of radioactive nobelium-259 has a half-life of 58 min. How much is left after 2 hours and 54 minutes?
Question 12 12. Any inclusion found within sedimentary rock must be _____ that rock.
Question 13 13. How old is Earth?
Question 14 14. How does an eon differ from an era?
Question 15 15. What divides the two major eons (the Precambrian and Phanerozoic Eons)?
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