Continental drift

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Continental drift
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Wegener and continental drift

• Continental Drift Theory that states that the
  continents have drifted from one location to
  another over time
• Wegeners support to his hypothesis
• a. Coasts of continents fit like puzzle pieces
• b. fossil remains found on two separate
  continents
• c. Rock formations found on different continents
  would match up
• d. Climate change evidence.

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Plate Tectonics

• Earths lithosphere is broken into plates that
  move on the asthenosphere
• Plate Tectonics A theory that describes the
  formation, movements and interactions of these
  plates

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Theory of plate tectonics

• Support Data about earthquakes, magnetism, the
  age of rocks on the ocean floor, some of Wegners
  findings
• As the plates move, the continents move.

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Locations of Earthquakes and volcanoes

• Most locations of earthquakes and volcanoes
  Location of plate boundaries

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Magnetism and the age of the ocean floor

• Magnetic minerals in magma orient themselves to
  face the magnetic pole as the magma solidifies
• Magnetic pole has reversed several times in the
  geologic past
• Record of age and pole switches

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This is what it looks like...
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The Mid-ocean ridge

• Mid-Ocean Ridge long chain of volcanic mountains
  on the ocean floor
• As new rocks rise in the middle as magma, it
  forces older rocks out to the side

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