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Convergent Plate Boundary Diagrams - Key What’s the problem with the oceanic-oceanic diagram when we use the Aleutians as a reference island arc? Name:_______________________________________ Date:_______________ Hour:_______ST#_______ Convergent and Divergent Plate Boundary Diagrams Fill in the blanks with the best term that corresponds with each number. Resources: http://pubs.usgs.gov/gip/dynamic/understanding.html http://www.learner.org/interactives/dynamicearth/tectonicsmap/ http://geology.com/nsta/convergent-plate-boundaries.shtml http://www.scienceclarified.com/landforms/Basins-to-Dunes/Continental-Margin.html http://www.livescience.com/43220-subduction-zone-definition.html http://www.universetoday.com/43822/subduction-zone/ Continental-Continental Convergence (C-C Convergent) 1._________________________________________ 4. _________________________________________ 2._________________________________________ 5. _________________________________________ 3._________________________________________ 6. _________________________________________ a. What is created during a continental-continental collision? b. Why do the two plates crumple and fold instead of one plate somewhat easily subducting under another the way it happens with oceanic/continental convergence? Oceanic-Oceanic Subduction/Convergence (O-O Convergent) 1._________________________________________ 4. _________________________________________ 2._________________________________________ 5. _________________________________________ 3._________________________________________ 6. _________________________________________ a. What two things are created at oceanic-oceanic subduction zones? b. Which tectonic plate is more dense, the one on the left or the right? How do you know? c. What is thought to happen to the plate on the left once it reaches the asthenosphere and continues to subduct deeper and deeper? Oceanic-Continental Subduction/Convergence (O-C Convergent) 1._________________________________________ 4. _________________________________________ 2._________________________________________ 5. _________________________________________ 3._________________________________________ 6. _________________________________________ a. What two things are created at oceanic-continental subduction zones? b. Why is the oceanic crust subducting under the continental crust? c. How do some of the mountains on the coast become volcanic (where does the magma originate)? d. These O-C convergent volcanoes tend to have more violent explosions than the ones in Hawaii due to the silica content of the continental plates and the steam created out of the water trapped in sediments that are subducted with the oceanic plate. Which plate material has more silica in it, continental or oceanic? What is the relationship between silica content and viscosity? Divergent Boundary 1 2 3 a. What feature of the crust is being created in Diagram 1? Name a location where this occurs. b. Why is the Rift Valley in Diagram 2 getting filled with water? c. What will be created on either side of the spreading center in Diagram 3? (2 things!)