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PS 2-7-08 Plate Tectonics Big Question • What part of the Earth moves and why • Compare diverging boundaries, converging boundaries and transform boundaries Oceanic meets Continental crust The west Coast of the US around Seattle and Portland West Coast Ocean-vs-Continent • More dense ocean crust is push beneath Continental crust When it is pushed deep enough it begins to melt The melted material is pushed upward, supplies material for volcanos Magma and Lava • Magma • Lava Continental material meets other continental material The mountains between India and China Subduction zone –The Himalayas Continent –vs-Continent • Nothing is pushed down much, similar density • Build Mountains • Keep building as long as pushing occurs • No volcanos Ocean-vs-Ocean • All based on age of rock, the oldest material is pushed under • Creates volcanic islands, or island ars Subduction zone - Japan One final type of boundary interaction TRANSFORM BOUNDARY Southern California • San Andreas Fault Transform • Moves past each other • Not creating or destroying material • Earthquakes Plate Tectonics • Describes continental movement • Describes why and how continents move What is a plate? • A plate is made up of a section of the earth’s crust and lithosphere underneath it • Lithosphere is brittle, so it breaks into pieces under enough force How do plates move? • New crust and lithosphere is made at diverging boundaries • This new material pushes the old material away • The Asthenosphere bends to allow the plates to move Tectonic plates of the world What happens to the islands that enters into a Subduction zone? Scraped off and added to the bigger continent The northern Californian coast Some evidence about the land we sit on Microplate Terrane Review • Plate Tectonics • Diverging Boundaries • Converging Boundaries • Transform Boundaries To sum up • Plate Tectonics What moves Cause of motion • Interactions between plates Diverging Boundaries Creation of Plates Rift Valleys Review Converging boundaries Destruction of plates 3 different scenarios Volcanic activity Mountain building Transform boundaries Move past each other No overlap Earthquakes no volcanoes Homework • Worksheet: – Do all multiple choice questions – Question 2 and 3 critical thinking Make your own world • On a piece of paper, create a map of a world of your design • Divide up the world using at least 2 diverging and 2 converging boundaries The rock cycle