1. The elevation of the abyssal ocean floor decreases, relatively smoothly, with
ID: 160472 • Letter: 1
Question
1. The elevation of the abyssal ocean floor decreases, relatively smoothly, with distance away from a mid-ocean ridge spreading center. Why is this? If the rate of spreading at a mid-ocean ridge were to increase, what might this do for the relative yet global (eustatic) level of the sea floor? How might this phenomenon be used to explain disconformites in the continental stratigraphic record?
2. What is heat flow? Why does heat flow to the surface of Earth? Identify three kinds of settings where the flow of heat to the earth’s surface may be unusually high or unusually low.
3. How was the geomagnetic polarity time scale of importance in finally determing the origin of mid ocean ridges and the mechanism for “continental drift”?
4. Our country WAS making plans to store large quantities of high level nuclear waste at Yucca Mountain, a sequence of thick pyroclastic silicic volcanic rocks, about 10 million years in age, located about 100 km northwest of Las Vegas, Nevada, in the Basin and Range Province. Geologically speaking is this a good idea? Why or Why not?
5. Name the Atlantic bordering continents. The Atlantic bordering continents are spreading away from each other, and a rate of about what: meters per year? Kilometers per year? Millimeters per year? Centimeters per year? When did these continents begin to disperse, and how do we know? In the context of continent configuration, what do you think will happen to our planet over the next 50 to 100 million years?
6. What are the essential components of a soil profile? What would be the likely difference between a soil in the American Southwest and one in upstate New York? Why does Idaho have “famous potatoes”?
7. Afghanistan and its immediate surroundings are part of a long mountainous belt stretching from where to where? What do you think this long mountainous belt is related to? Do you think that it is an old mountainous belt, or a relatively young one, and why?
Explanation / Answer
1. The elevation of the abyssal ocean floor decreases, relatively smoothly, with
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