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Plate Tectonics

Plate Tectonics. The Earth’s crust consists of a number of plates which are in motion (quite slow). The Layers of the Earth.

robert-barr
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Plate Tectonics

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  1. Plate Tectonics The Earth’s crust consists of a number of plates which are in motion (quite slow)

  2. The Layers of the Earth

  3. The movement of crustal plates results from convection currents in the Mantle. Heat from the formation of the Earth and radioactive decay escapes at the Earth’s surface.

  4. Some plates contain mainly oceanic crust and some contain both continental and oceanic crust.

  5. Shortcut to Bullard Fit of Continents

  6. The Glomar Challenger was the first research vessel specifically designed in the late 1960s for the purpose of drilling into and taking core samples from the deep ocean floor.

  7. Remote Sensing- uses energy signals from Earth to determine many different kinds of information

  8. Earthquake Zones

  9. Earthquake and Volcano Activity closely matches the plate boundaries!

  10. Mid-Ocean Ridges

  11. Computer-generated detailed topographic map of a segment of the Mid-Oceanic Ridge

  12. Shortcut to Sea Floor SpreadingShortcut to Formation of Ocean Crust

  13. There is evidence of “Sea floor spreading” on either side of the Mid-Atlantic Ridge

  14. Divergent boundaries occur along spreading centers where plates are moving apart and new crust is created by magma pushing up from the mantle.

  15. Iceland is right on an oceanic-oceanic Divergent Plate Boundary

  16. Plate Boundaries

  17. Convergent boundaries are where plates are moving toward each other, and sometimes one plate sinks (is subducted) under another. The location where sinking of a plate occurs is called a subduction zone. subduction

  18. Heat from friction melts rock and the magma forms volcanoes

  19. Mount Baker (Washington)

  20. Mount Rainier (Tacoma in foreground)

  21. Deep trenches are formed in the ocean floor where subduction begins

  22. Oceanic-oceanic convergent boundaries produce volcanic Island Arc’s

  23. An oceanic-oceanic convergent boundary. They also produce a trench

  24. Where might we find trenches?

  25. The Mariana Trench is the deepest known trench. The bottom of the trench (Challenger Deep) is further below sea level than Mount Everest is above it. The trench has a maximum depth of 10,911 m (35,798 feet) below sea level.

  26. Continental-continental Convergent plate boundaries can produce mountain ranges.

  27. Transform Boundaries The zone between two plates sliding horizontally past one another is called a transform-fault boundary, or simply a transform boundary. transform faulting

  28. Some Transform Boundaries

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