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6. How much iron is in the Earth's composition?

  • 34.6 %
  • 40 %
  • 56 %
  • 36 %
  • 26.2 %

7. How much oxygen is there in the Earth's composition?

  • 39.3%
  • 29.5 %
  • 22.4%
  • 22 %
  • 14%

8. How much silicon is there in the composition of the Earth?

  • 13.4%
  • 9%
  • 15.2 %
  • 16.8%
  • 12.9%

9. How much magnesium is there in the Earth's composition?

  • 34.2%
  • 12.7 %
  • 16.2%
  • 14.5 %
  • 19.8%

10. How much nitrogen is there in the atmosphere?

  • 33%
  • 77 %
  • 55 %
  • 66 %
  • 28 %

11. How much oxygen is there in the Earth's atmosphere?

  • 19%
  • 21 %
  • 2%
  • 44%
  • 22%

12. What is the Earth's surface area of ocean?

  • 66.6 %
  • 22 %
  • 16 %
  • 71 %
  • 54 %

13. What is the Earth's surface area of land?

  • 46 %
  • 15%
  • 29 %
  • 62%

14. What is the mean surface temp on Earth?

  • + 14 degrees celsius
  • -2 degrees celcius
  • 0 degrees celsius
  • + 15 degrees celsius

15. Without greenhouse gases surface temperature on Earth would be?

  • - 22 degrees celsius
  • +40 degrees celsius
  • -21 degrees celsius
  • +300 degrees celsius

16. Land surface elevation varies between how much?

  • -12 km to +9 km
  • -22 km to +17 km
  • +6 km to + 7 km

17. What does hypsometry mean?

  • The different distribution of different elevations on Earth.
  • It is a measurement of height.
  • The height of the highest peaks.

18. At what height are the two biomodal peaks of the Earth's hypsometry?

  • -4 km and +1 km
  • -6 km and +2 km

19. What elevation does continental surface range between?

  • +8.8 km and -0.2 km
  • -12 km and +4 km

20. What does the ocean base range between?

  • -0.2 km to 11 km
  • +0.8 km to -9 km