Early geologists tried calculating the age of Earth based on sedimentation rates and deduced ages of 1 million to 2
billion years old. Explain the logic behind using sedimentation rates to calculate the age of Earth, and explain at least two
reasons why this method did not work. What will be an ideal response?
The idea was that by measuring how thick a sedimentary unit was and knowing the
sedimentation rate, the age of the Earth could be calculated by dividing the thickness by the
rate.
Geologists made several faulty assumptions.
1. Sedimentation rates vary geographically and over time, and even by rock type.
2. There is no way to account for erosion of sedimentary layers.
3. There is no way to determine how thickness has been affected by compaction.
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Which of the following molecules would you expect to be the most strongly attracted to a Cl- ion?
A. H-F B. H3C-CH3 C. CCl4 D. Cl-Cl E. F-F
Supplies of potable freshwater are in short supply in many parts of the world because
A. of salt water intrusion. B. of pollution of lakes and rivers. C. irrigation uses all of the freshwater is many areas. D. None of these are correct.
The most important trigger for cyclogenesis is
A) short-waves in the jet stream. B) mountain barriers. C) a weak temperature gradient. D) the presence of a front. E) none of the above
Which statement most supports the ethical guidelines for living more sustainably?
A. Reducing the earth's natural capital will be offset by new technologies. B. The earth's capacity for self-repair is without bounds. C. Resources are available for the ultimate needs of humans. D. Increasing energy needs can be met through innovation. E. Climate-disrupting activities should be minimized.