Unit Six Notes

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Plate Tectonics
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Warm-Up

• What evidence do we have that supports the idea
  of one giant supercontinent (Pangaea)? Cite
  evidence from Alfred Wegners findings.
• What force is causing the Earths plates to move?

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How is this possible?!?!?
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Objective

• By the end of class you will.
• Be able to identify the three different types of
  plate boundaries.

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3 Types of Plate Boundaries

• Convergent
• Divergent
• Transform

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• Convergent Boundary plates are moving toward
  each other and are colliding (3 types)

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When a continental plate collides with another
continental plate

• Mountain ranges are created
• (example Himalayan Mountains)

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The Himalayas
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When Oceanic Plates collide with Continental
Plates

• Create subduction zones or trenches
• Create near coast volcanoes
• Example Ring of Fire!

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When ocean plates collide with other ocean plates

• Island arcs are created
• (a pattern of volcanic islands created from a
  subduction zone that is located off the coast)

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Aleutian Islands
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Plate Boundaries

• Divergent boundary
• Plates are moving away from each other

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Plate Boundaries

• Divergent boundary

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Transform Fault Boundary

• Plates are neither moving toward nor away from
  each other, they are moving past one another.

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Transform Fault Boundary

• The plates may move in opposite directions or in
  the same directions but at different rates and
  frequent earthquakes are created! (example San
  Andreas Fault)

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San Andreas Fault
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Lets Play Name That Boundary!
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North American Plate
Pacific Plate
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How can Oreos model the plate boundaries?

• Very carefully, take just the top cookie off the
  Oreo.
• Break the top cookie into 2 equal halves.
• Replace the cookie halves back on the Oreo
• Using the cookie,
• Demonstrate a transform fault boundary
• Demonstrate a divergent plate boundary
• Demonstrate a convergent plate boundary

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Quiz Time!