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Earth science 9.3

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Earth science 9.3 Presentation Transcript

  • 1. Chapter 9 Section 3
  • 2. Key Concept 1. What Is Seafloor Spreading? -Seafloor Spreading is the process by which plate tectonics produces new oceanic lithosphere.
  • 3. Key Concept 2. What Is A Subduction Zone? -A Subduction Zone occurs when one oceanic plate is forced down into the mantle beneath a second plate.
  • 4. Oceanic Ridge A continuous elevated zone on the floor of all major oceans basins and varying at the crests of ridges represent divergent plate boundaries
  • 5. Rift Valley A Rift Valley is a deep faulted structure found along the axes of divergent plate boundaries; Rift valleys can develop on the seafloor or on land.
  • 6. Trench A Trench is a surface feature in the seafloor produced by the descending plate during subduction.
  • 7. Continental Volcanic Arc Continental Volcanic Arcs are mountains formed in part by volcanic activity caused by the subduction of oceanic lithosphere beneath a continent.
  • 8. Volcanic Island Arc A Volcanic Island Arc is a chain of volcanic islands generally located a few hundred kilometers from a trench where subduction of one oceanic slab beneath another is occurring.
  • 9. The End. The End