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Tectonic Plates Boundaries

Tectonic Plates Boundaries. Divergent Boundary. Features. Oceanic from Oceanic Crust. Continental From Continental Crust. Mid-Ocean Ridges Earthquakes Volcanos Black Smoker. Rift Valley Rift Volcanos Earthquakes. Example. Oceanic from Oceanic Crust.

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Tectonic Plates Boundaries

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  1. Tectonic Plates Boundaries

  2. Divergent Boundary

  3. Features • Oceanic from Oceanic Crust • Continental From Continental Crust • Mid-Ocean Ridges • Earthquakes • Volcanos • Black Smoker • Rift Valley • Rift Volcanos • Earthquakes

  4. Example • Oceanic from Oceanic Crust • Continental From Continental Crust • Mid-Atlantic Ridge • Red Sea • East African Rift in Africa • Mid-Atlantic Ridge in Ice Land

  5. MOTION Plate Motion Cause of Plate Motion • Plates are pulling apart or separating from each other • Convection Currents • Hot magma rises out of the mantle and pushes the cold old lithosphere out of the way. • DENSITY • Creates new crust

  6. Convergent

  7. Features • Continent to Continent • Mountain building • Earthquakes • Ocean to Continent • Volcanic Arc (on land) • Earthquakes • Mountain building • Trench • Ocean to Ocean • Volcanic Island Arc (ocean) • Trenches • Long and narrow deep-sea • Earthquakes

  8. Examples • Continent to Continent • Himalayas • Ocean to Continent • Juan De Fuca and North American Plate • Nazca and South American Plate • Ring of Fire • Ocean to Ocean • Philippians, Japan, South Sandwich Island

  9. Plate Motion • Continent to Continent • Plate collide and eventually the denser plate is pushed under • Ocean to Continent • Oceanic crust is more dense then the continental, thus it is subducted (sinks) underneath the continental plate • Ocean to Ocean • The denser plate sinks

  10. Cause of Plate Motion • Lithosphere cools and is then pulled down into the mantle by gravity. • The denser tectonic plate is subducted(pulled down) • The plate is then recycled into the mantle

  11. Transform Right Lateral Left Lateral • Slips to the right • Slips to the left

  12. Which is Which?

  13. Transform • Features: • Lithosphere is not created or destroyed • Earthquakes • Found at mid-ocean ridges because of the offset (the Earth is a sphere) • Example: • San Andreas Fault in California • Romanche Fracture Zone • MOTION: • Horizontal slip between two plates • Slip can occur to the right or left • Shear Stress • Cause of Plate Motion: • Convection currents moving plates over a round object

  14. HOT SPOTS/Mantle Plumes • Thought to be caused by Mantle Plumes • Mantle plume: narrow, tube-shaped jet of hot, solid material rising from deep within the mantle

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