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Plate Tectonics drives 2 Stages of Crust-making 1. Mantle partially melts to make ocean crust

Plate Tectonic Theory – The Earth’s outer shell (lithosphere) is composed of rigid plates that are moving relative to one another. Plate Tectonics drives 2 Stages of Crust-making 1. Mantle partially melts to make ocean crust 2. Ocean crust melts to make continental crust.

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Plate Tectonics drives 2 Stages of Crust-making 1. Mantle partially melts to make ocean crust

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  1. Plate Tectonic Theory – The Earth’s outer shell (lithosphere) is composed of rigid plates that are moving relative to one another.

  2. Plate Tectonics drives 2 Stages of Crust-making 1. Mantle partially melts to make ocean crust 2. Ocean crust melts to make continental crust

  3. What moves the Plates? Slab Pull Mantle Push Ridge Slide

  4. Types of Plate Boundaries

  5. Divergent Plate Boundaries Mid-ocean Ridges Where Stage 1 Crust is Made

  6. Youthful Oceanic Crust

  7. Basalt – Rock Type of the Oceanic Crust Remember: Melting the mantle makes mafic magma!!Always

  8. Continental Rifting The creation of new ocean basins

  9. 200 Ma The Break-up of Pangea 75 Ma 125 Ma

  10. Convergent Boundaries Making 2nd Stage Crust Ancient Continental Crust

  11. Convergent Boundaries- Where the Action Is!! Ocean - Ocean Earthquakes Ocean- Continent Volcanoes Continent - Continent

  12. Consequences of Convergence Explosive Volcanism Mt. St. Helens May 18, 1980

  13. Consequences of Convergence Mountain Building and Rock Deformation

  14. Consequences of Convergence Earthquakes Banda Ache, Dec. 26, 2004

  15. OROGENESIS The Culmination of Convergence

  16. Transform Boundaries San Francisco Earthquake April 18, 1906 Mag 7.8

  17. Mantle Hotspots Creation of overthickened oceanic crust

  18. Famous Hotspots Yellowstone? Hawaii Iceland

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