GLY3850 Homework: Plate Tectonics Name: The purpose of this homework is to help you understand plate boundaries. One of the best ways to validate your understanding is to sketch the boundaries in cross-section. All questions are worth 3 points unless otherwise indicated. The image above shows the lithosphere of two plates, one on the left and one on the right. 1. What kind of plate boundary is this? (If it’s convergent, identify it as O-O, C-O, or C-C convergent.) (4 pts) 2. 3. 4. 5. 6. 7. Draw arrows in the margins to the left and right indicating the relative motions of the two plates. Draw the Moho (separating the crust and mantle) on both plates, as accurately as possible. If the sea surface appears, draw it on the diagram and label it. If an accretionary prism (also called accretionary wedge) appears, draw it and label it. If a submarine trench appears, label it. What is the composition at points A-E? (Use the vocabulary ultramafic-felsic) (10 pts) A B C D E 8. Which, if any, points A-E lie in the asthenosphere? 9. Lightly shade the region where melting occurs. 10. If any volcanoes appear on the surface, indicate this with a little smoking volcano cone 11. Draw five small x’s on the diagram to locate the location of deep earthquakes in the Wadati-Benioff zone. This cross-section also shows the lithosphere of two plates, one on the left and one on the right. 1. What kind of plate boundary is this? (If it’s convergent, identify it as O-O, C-O, or C-C convergent.) (4 pts) 2. 3. 4. 5. 6. Draw arrows in the margins to the left and right indicating the relative motions of the two plates. Draw the Moho (separating the crust and mantle) on both plates, as accurately as possible. If the sea surface appears, draw it on the diagram and label it. If a submarine trench appears, label it. What is the composition at points A-C? (Use the vocabulary ultramafic-felsic) (6 pts) A B C 7. Which, if any, points A-C lie in the asthenosphere? 8. Lightly shade the region where melting occurs. 9. If any volcanoes appear on the surface, indicate this with a little smoking volcano cone. 10. Draw five small x’s on the diagram to locate the location of deep earthquakes in the Wadati-Benioff zone. This cross-section shows the top of the oceanic crust; your job is to draw what’s under (and above) it. Hint: there are two plates in this diagram. What kind of plate boundary is this? (If it’s convergent, identify it as O-O, C-O, or C-C convergent.) (4 pts) 1. 2. 3. 4. 5. 6. 7. 8. Draw arrows in the margins to the left and right indicating the relative motions of the two plates. Draw the Moho (separating the crust and mantle) on both plates, as accurately as possible. If the sea surface appears, draw it on the diagram and label it. Carefully show the Moho on both plates. Carefully show the bottom of the lithosphere on both plates. Make sure you make it to scale with the crust. Carefully show the layer of sediment that appears on the seafloor. Lightly shade the region where melting occurs. If any volcanism appears on the seafloor, indicate this with a tiny smoking volcano cone.

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