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Earth Layers / Continental Drift

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  • What are convection currents?
    Hot fluids rising (by becoming less dense) and cold fluids sinking (by becoming more dense)
  • What idea/observation caused Wegener to come up with his theory?
    He thought South America and Africa fit like puzzle pieces
  • Did scientists accept Wegener's Theory at first? Explain why.
    No, they couldn't imagine HOW - and Wegner could not provide proof of this
  • Which layer is responsible for our magnetic field?
    Outer core
  • What is our core made out of?
    Iron and Nickel
  • What year did Alfred Wegener propose his theory?
    1912
  • Which is the densest layer of Earth?
    Inner core
  • Which is the thinnest layer of earth?
    Crust
  • How much do our tectonic plates move a year?
    About an inch
  • Who came up with the theory of continental drift?
    Alfred Wegener
  • Which is the thickest layer of Earth?
    Mantle
  • The theory that there was once one giant landmass that came together as one, and eventually broke apart into our continents today
    Continental Drift Theory
  • As you go further into Earth what 2 things happen?
    Pressure and heat increases
  • When did Pangaea exist?
    200-250 mya
  • What is density?
    How tightly packed atoms are
  • What state of matter is the mantle?
    Semi-solid
  • What state of matter is the inner core?
    Solid
  • Which layer contains convection currents?
    Mantle
  • Which is the hottest layer of Earth?
    Inner core
  • What does Pangaea stand for?
    Supercontinent / "Whole Earth"
  • What were the 3 pieces of evidence that support Alfred Wegener's Continental Drift?
    -Fossils/rocks/tropical plants , -seafloor spreading, - plates are still moving today
  • What are our 4 earth layers
    crust, mantle, outer core, inner core
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