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6. what is more abundant 16O, 17O or 18O?
- 16O (99.76%) 17O (0.024) 18O (0.20)
- 17O (90%) 16O (9%) 18O (1%)
- 18O (92.10)% 16O (7.76%) 17O (0.14%)
7. what percentage of oil are in offshore resources?
8. what are evaporites?
- they form in wet environments
- minerals that form when seawater evaporates
- they form in volcanic conditions
9. where do phosphates occur?
- in areas of high biological productivity
- in areas of low biological productivity
- in shallow marine environments
10. in some rivers there is high sediment deposition when it meets the ocean, why is that and what does that indicate?
- high productivity due to a fast flow, it also is an indicator of oil
- low productivity, it indicates pollution
- fast flow environment it also indicates petrodollars
11. how much do pelagic sediments cover the sea floor?
12. where do metal sulfids occur?
- in the inner core
- in areas of high hydrothermal activity eg. volcanoes, hydrothermal vents, MORs
- in areas of moderate to high hydrothermal activity