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Sea Floor Spreading

Sea Floor Spreading. HDWK. Mid Ocean Ridges Detected a long time ago Molten Material (go look! Pillow Lava!) Magnetic Stripes Drilling Samples Subduction and Deep Ocean Trenches. Mid Ocean Ridges. Mid-Atlantic Ridge Pingvellir, Iceland.

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Sea Floor Spreading

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  1. Sea Floor Spreading

  2. HDWK • Mid Ocean Ridges • Detected a long time ago • Molten Material (go look! Pillow Lava!) • Magnetic Stripes • Drilling Samples • Subduction and Deep Ocean Trenches

  3. Mid Ocean Ridges

  4. Mid-Atlantic RidgePingvellir, Iceland

  5. Iceland is ripping apart – but it gets filled in with new lava – so it gets bigger!

  6. Africa is tearing apart too

  7. How Convection helps Sea Floor Spreading (traditional version)

  8. Go Look for Volcanic Activity! • Pillow lava from the Mid-Atlantic Ridge • Shows activeeruptions • Sonar of a volcano & pillows

  9. Magnetic Stripes – Reversals

  10. Drilling the Sea Floor for Rock Ages

  11. Glomar Challenger • Drilling for Rocks (and used for other things! but we’d have to kill you if we told you what it was for )

  12. Can it Spread Forever?? • No Way, It has to go somewhere, and usually it dives under a continent! • Oceanic Crust is Denser than Continental Crust – so it sinks under the continent. • This process is called Subduction and makes the Deep Ocean Trenches

  13. Subduction and Deep Ocean Trenches

  14. More Detail than you want! Subduction!

  15. Some Vocab • Plate • Convergent Plate Boundary • Divergent Plate Boundary • Transform Plate Boundary • Sea Floor Spreading • Magnetic Reversal • Rift Zone • Subduction • Island Arc

  16. Hawaii is Special • Hawaii is special, it is on the Pacific Plate, but the hotspot under the Big Island appears to have been there for 70+ million years. • The evidence is the chain of islands stretching out to the NW from Hawaii to Kure – and on along the Emperor Seamount chain.

  17. Kea and Loa

  18. Tectonic Plates - names

  19. Most of the volcanoes are located on or near ___________________ • _________ volcano is the only one in the middle of a ___________.

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