Physical Geology On-line Lab and Helpful Lab Hints

Exercise 17: Plate Tectonics

Problem 2

1. For the type of plate boundary, refer to the drawings on pages 325 and 328 in the lab book and to Chapter 3 in the textbook.
2. Do not complete
3. Draw a profile on the graph on page 335. Use the annotated figure as a guide.
   • annotated map & graph
   • Why are the earthquakes where they are? Hint: refer to the Lab book p. 326-327 (Earthquakes)
4. The earthquake zone marks the location of the subducting plate.
   • Use these annotated graphs to help guide you.
   • Measure the angle as indicated.
   • Be sure to draw arrows on the cross section to show the directions in which the two plates are moving. Refer to the figures in the lab book (p. 328) if you aren't sure.
5. What feature is present on the ocean floor? Look on the upper profile on p. 335 and the map on p. 334.
   • Hint: the feature is labeled in the figures on p. 328; it is the deepest place on the ocean floor.
   • Use these annotated graphs to help guide you.
6. Label the top part of Figure 17.10 (p. 335)
   • Refer to the figures in the lab book (p. 328) for this part.
   • Measure the arc-trench gap on the map on page 334 (or on the graph on p. 335). Find the line of volcanoes (use the key on page 333) and measure the distance from the line of volcanoes to the center of the trench. The map scale to use is 1cm = 100 km.
   • Use these annotated graphs to help guide you.

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last updated: 2020-04-20