Sea-Floor Spreading and Theory of Plate Tectonics Objectives
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When an ocean plate and continental plate converge, a similar event happens. The ocean plate is subducted under the continental plate and creates a chain of volcanic mountains along the coast. The Andes Mountains along the west coast of South America and the Cascade Mountains along the northwest coast of the United States (includes Mt. St. Helens) form this way. 
Look at the plate boundary map on the next page and try to locate each of the places mentioned in the text and then use the key to see what type of plate boundary is located there.  Questions
Look at the map on the previous page. For each location given, tell what type of boundary is present and the landform. If possible give the specific name of the landform (ex. don’t say volcanic mountain, but Cascade Mountains). 1. Brazil (northern South America) 2. East of Saudi Arabia (Persian Gulf) 3. Hawaii (middle of Pacific Plate) 4. Philippian Islands (north of Australia) Research question: Where is the Mariana Trench located? Is it along a plate boundary? If so, what kind. How deep is the trench? 5. The process that continually adds new material to the ocean floor is called ___________________________. 6. Deep underwater canyons are called _________________________. 7. What is subduction? 8. The lithosphere is broken into separate sections called _____________________. 9. State the theory of plate tectonics. 10. Is the following sentence true or false? The theory of plate tectonics explains the formation, movement, and subduction of Earth’s plates. Matching 11. _____ plate tectonics a. deep valley that forms where two plates pull apart 12. _____ fault b. line where different pieces of the lithosphere meet 13. _____ rift valley c. break in Earth’s crust where rocks have slipped past each other 14. Compete the table.
15. Complete the table on convergent boundaries.
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