EARTH’S CRUST

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					EARTH’S CRUST
     Centre of the Earth




• Approximately 6400 km
  below the surface
            Inner Core
• A mass of iron with a temperature of
  3870* C
• At such temperatures iron would
  normally melt BUT immense pressure
keeps it in a solid state
Approximately 2400 km in diameter
                Outer Core
•   Mass of molten iron
•   Approximately 2200 km thick
•   Surrounds the solid inner core
•   Electrical currents generated from this
    area produce the Earth’s magnetic field
                 Mantle
• Approximately 2850 km thick
• It reaches about half the distance to the
  centre of the earth.
• Parts of this layer become hot enough to
  liquefy and become slow moving rock
  called magma
              Crust


• Layer of rock varying from 10 km
  thick under the ocean floors to
  100 km thick under the mountains
              Lithosphere


• The rigid outer 100 km of the Earth
• This includes the crust and the top of the
  upper mantle
              QUESTION
• How do we know that it is hot beneath the
  Earth’s crust?

• Volcanoes erupt
• In some places on the Earth’s surface:
  mud appears to boil
• Geysers erupt
• Hot springs

				
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posted:12/18/2011
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