107Lab04PlateTectonics - GEOL 107 LAB 4 PLATE TECTONICS...

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G EOL 107 L AB 4 - P LATE T ECTONICS WEEK OF S EPT . 24-28, 2007 WORK IN PENCIL ONLY - NO INK PART A. INTRODUCTION TO PLATE TECTONICS AND TYPES OF PLATE BOUNDARIES 1. Use the Physiographic Chart (provided by your TA), display posters, and figures in your textbook to complete the following: a. Label the major plates: North America, Pacific, Eurasia, South America, Nazca, Australian, and Antarctic. b. Use a RED pencil to highlight (trace) these divergent boundaries - East Pacific Rise and Mid-Atlantic Ridge. New ocean crust is created at these boundaries! c. Use a BLUE pencil to highlight (trace) the following oceanic trenches: Mariana Trench Aleutian Trench Middle America Trench (Mexico Trench) Peru-Chile Trench Oceanic crust is destroyed in these places! d. Place GREEN arrows to indicate the direction of motion for the South America, Pacific, North American, Nazca, and Africa plates. 2. Volcanic and earthquake activity is very common around the edges of the Pacific Ocean Basin. Why? (one to two sentences – look at Pacific Ocean map, and your physiographic chart) 3. Earthquakes are rare (but not impossible) along the eastern coasts of North and South America. Why? (one to two sentences – look at Atlantic Ocean map, and your physiographic chart) 4. What obvious feature(s) -- looking at the Pacific Ocean map and the Atlantic Ocean map – distinguishes a passive continental margin from an active continental margin? 1 of 8
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5. Use the Pacific Ocean map and your physiographic chart. Find the Peru-Chile trench. a. What type of plate boundary is located here? BE SPECFIC b. Name the two plates that are interacting. c. Draw a cross-section (side view) of this plate boundary. Include lithosphere, asthenosphere, subduction zone, Andes Mts., Peru-Chile trench, and green arrows to show direction of descending slab. Cross-section view of plate boundary question #5. 6. Using the Pacific Ocean map , how is the boundary you described in question #5 different from the plate boundary at the Aleutian trench? Answer in one or two sentences.
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