Why is correlation needed to construct a complete geologic history of a region? How does correlation
work, e.g., in the Colorado Plateau region? What will be an ideal response?
No single location in a region has a geologic record of all events that occurred in its history;
correlation allows geologists to determine the complete geologic history of the region. The entire 2-
billion-year record of the Colorado Plateau is not preserved in a single location due to erosion. By
correlating the uppermost rocks at one location with the lowermost equivalent rocks of another area,
the entire geologic sequence can be put together
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How come an animal's carbon-14 levels do not start to decrease until it dies?
A) because it constantly replenishes its carbon-14 supply by eating plants with carbon-14 in them B) because it constantly replenishes its carbon-14 supply by breathing air with carbon-14 in it C) because it is constantly being bombarded with cosmic rays D) carbon-14 only starts to decay after the animal dies E) The carbon-14 levels do not decrease because the carbon-13 in its skin protects it from cosmic rays.
Using the flood frequency curve in Figure 22.2 (and colored pencils to mark on graph), estimate the recurrence interval of a flood of the following magnitudes:
200 cms: _____________
1500 cms: _____________
3000 cms: _____________
The universe is 14 billion years old. If the universe is not expanding, how long will it be until a galaxy 17 billion light-years away is at the edge of our observable universe?
The residence time of water in the atmosphere is about:
A) 12 hours. B) 1 day. C) 10 days. D) 100 days.