Questions for Geology Plate Tectonics Lab 1
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Plate Tectonics (Lab 1)Use the lab information, online textbook, and lecture slides to answer the following question.
1. What is the name of the plate on which the United States of America is represented?
2. Is there continental lithosphere on this plate? Is there an oceanic lithosphere? Or perhaps both?
3. Where does the Atlantic Ocean’s lithosphere form?
4. What type of plate boundary can be seen on South America’s west coast?
5. Is Africa’s west coast a plate boundary?
6. How well do the continents of South America and Africa appear to fit together on the lab map? If there are any issues, what are they?
7. Are the existing coastlines of South America and Africa accurate representations of the continents’ original boundaries? Other than rifting and seafloor spreading, what other causes could have influenced these shorelines?
8. Take another look at these continents; do the tan/brown continent boundaries OR the light blue continental shelves fit together more accurately?
9. Based on your response to question 8, where does a continent’s real edge lie?
10. What is the white arrow pointing at in the top center of the figure above?
11. What is going on in this area?
12. How does the volcanic and seismic activity on the west coast of North America compare to the figures 2.4 and 2.5 in the lab?
13. Look at figures 2.4 and 2.5, which show a chain of volcanoes and a line of earthquakes in the middle of the Atlantic Ocean. What do you think is the source of these occurrences?
14. Is there a pattern to the positive and negative magnetic stripes (anomalies) maintained in the marine crust, or are they orientated randomly? Is there any explanation for these orientations other than seafloor spreading? If this is the case, please explain.
15. Why do you think some magnetic stripes are wider than others, based on your knowledge of seafloor spreading?
16. What does this progressive chain of volcanic centers reveal about the origins of Yellowstone’s active volcanism?
17. What was the average speed and direction of North American Plate motion relative to the hotspot in Yellowstone since 13.8 million years ago, based on the map? To depict this movement, add an arrow (vector) and a rate label to the map.
18. Using the lab, calculate the average rate at which BNA has drifted away from the ridge at A over the last 67.7 million years in terms of centimeters per year.
19. Based on the lab, what was the average speed at which BAF drifted away from A?
20. Which plate, if either, migrated quicker relative to the ridge over the past 67.7 million years, based on your responses above?
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Questions for Geology Plate Tectonics Lab 1