chemistry - earths structure

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  • Earth's structure
    • Outer core
      • Made from liquid nickel and oil
    • Inner core
      • Made from solid nickel and oil
    • Mantle
      • Has the properties of a solid but can flow very slowly
    • Crust
      • Relatively thin and rocky
    • The Earths crust is a very thin layer.  It's thickness can vary from 5km thick to 70km thick under the continents.
    • The mantle is nearly 3000km thick.
    • The core is about 3500 km thick (radius)
    • We know that the Earth's structure is like this because scientists have monitored seismic waves (earthquakes).
    • Convection currents in the mantle move the crust.
    • The earth's surface is made up of tectonic plates - like a giant jigsaw.
    • Tectonic plates move a few centimeters a year.
    • The ocean floors are constantly moving, spreading from the center and sinking at the edges.
    • The earth has a semi-fluid mantle where density increases with depth.
    • Core, made of molten nickel and iron.  The inner part heats up turning it into a liquid.
    • Wegner believed in the theory of continental drift.
      • All continents were once connected and over time they have drifted apart.
  • Convection currents beneath the plates move the plates in different directions.


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