Sea Floor Spreading.

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Sea Floor Spreading and Plate Tectonics

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Presentation transcript:

Sea Floor Spreading

HDWK Mid Ocean Ridges Molten Material (go look! Pillow Lava!) 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

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

Africa is tearing apart too

How Convection helps Sea Floor Spreading (traditional version)

Go Look for Volcanic Activity! Pillow lava from the Mid-Atlantic Ridge Shows active eruptions Sonar of a volcano & pillows

Magnetic Stripes – Reversals

Drilling the Sea Floor for Rock Ages

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 )

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

Subduction and Deep Ocean Trenches

More Detail than you want! Subduction!

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

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.

Kea and Loa

Tectonic Plates - names

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