CD/Web Review Questions

Chapter 11, The Archean Eon of Precambrian Time

  1. Did most major groups of modern bacteria appear before or after the end of Archean time? Hint

  2. If the 4.6 billion years of Earth's history were compressed into a year, when would the Earth have formed? Hint

  3. What does "Hadean time" refer to? Hint

  4. What are planetesimals? Hint

  5. Both Earth and the moon have iron cores. True or false? Hint

  6. The moon has exactly the same oxygen isotope composition as the Earth. True or false? Hint

  7. What was one early hypothesis about how the moon formed? Hint

  8. What are the two most abundant elements in the Earth's crust? Hint

  9. What are the two most abundant elements in the whole Earth? Hint

  10. Which three terranes of the Canadian Shield are of Archean age? Hint

  11. The oldest body of continental crust yet discovered is in the Slave Province of Canada. Approximately how old is it? Hint

  12. The total amount of heat produced within the Earth near the end of the Archean was about _______ times what it is now. Hint

  13. Was Earth's earliest crust felsic, mafic, or ultramafic? Hint

  14. What component thought to be essential to life, other than amino acids, was generated in a recent experiment by Stanley Miller's research group? Hint

  15. Was the earliest solar nebula warm or cold? Hint

  16. In addition to a rocky crust, a gravitational field that is not too strong or too weak, and the presence of liquid water, what other major characteristic of the Earth makes it conducive to life? Why? Hint

  17. What causes Earth's magnetosphere? Hint

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