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The Changing Earth - PowerPoint PPT Presentation


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The Changing Earth. Chapter Eleven: Plate Tectonics. 11.1 Pangaea 11.2 Sea Floor Spreading 11.3 Plate Boundaries. 11.3 Plate boundaries. Imagine a single plate, moving in one direction on Earth’s surface. One edge of the plate—the divergent boundary —moves away from things.

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chapter eleven plate tectonics
Chapter Eleven: Plate Tectonics
  • 11.1 Pangaea
  • 11.2 Sea Floor Spreading
  • 11.3 Plate Boundaries
11 3 plate boundaries
11.3 Plate boundaries
  • Imagine a single plate, moving in one direction on Earth’s surface.
  • One edge of the plate—the divergent boundary—moves away from things.
  • The opposite edge—called the leading edge or convergent boundary bumps into anything in the way.
11 3 plate boundaries5
11.3 Plate boundaries
  • An edge of a lithospheric plate that slides by another plate is called a transform fault boundary.
11 3 divergent boundaries
11.3 Divergent boundaries
  • Divergent boundaries are found in the ocean as mid-ocean ridges.
  • A divergent boundary is the line between two plates where they are moving apart.
  • This type of boundary is found over the rising plume of a mantle convection cell.
11 3 divergent boundaries9
11.3 Divergent boundaries
  • Divergent boundaries can also be found on continents as rift valleys.
  • When a rift valley forms on land, it may eventually split the landmass.
11 3 convergent boundaries
11.3 Convergent boundaries
  • When oceanic plates collide, one subducts under the other.
  • This forms a valley in the ocean floor called a trench.
11 3 convergent boundaries12
11.3 Convergent boundaries
  • What happens if an oceanic plate and a continental plate collide?
  • Which plate would subduct?
  • The oceanic plate must subduct under the continental plate.
  • A continental plate is simply too buoyant to subduct under an oceanic plate.
11 3 mountains and convergent boundaries
11.3 Mountains and convergent boundaries
  • What happens if an oceanic plate with a continent on it subducts under a continental plate?
  • The continents cannot be sucked into the trench because their granite rocks.
  • The two continents collide!
11 3 mountains and convergent boundaries15
11.3 Mountains and convergent boundaries
  • Mountain ranges are formed when continents collide.
11 3 transform fault boundaries
11.3 Transform fault boundaries
  • A good clue for locating transform faults is offsetting.
  • When seen from above, the feature will appear to make a zig-zag.
11 3 slickenslides evidence of plate boundaries
11.3 Slickenslides, evidence of plate boundaries
  • The effect of rock moving against rock is evidence of plate boundaries.
  • The rock surface moving to the right is called slickensidesbecause it is smooth and polished.
11 3 earth s lithospheric plates
11.3 Earth’s lithospheric plates
  • Can you identify the three types of plate boundaries labeled A, B, and C?.
geology connection
Geology Connection

Where to go for Volcanoes

  • There are many volcanoes on the mainland of the United States.
  • In the recorded history of Earth, more than 500 volcanoes have erupted.
activity
Activity

Make a Plate Tectonics Book

  • Your book will recount part of the plate tectonics story.
  • Use the graphic on this page and others in Chapter 11 to help you outline your story.