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Why earth behaves as a magnet

  1. May 2, 2010 #1
    why earth behaves as a magnet
     
  2. jcsd
  3. May 2, 2010 #2

    Astronuc

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    Re: gravitation

    Is one referring to gravitation, a property of matter, or is one referring to the Earth's magnetic field, which is due to the liquid ferro-nickel core (mostly iron with some nickel)?
     
  4. May 2, 2010 #3
    Re: gravitation

    sir i m talking about the existence of two magnetic poles.what is the reason behind it and what property of the make it happen.please explain
     
  5. May 2, 2010 #4

    Astronuc

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    Re: gravitation

    One explanation:

    http://csep10.phys.utk.edu/astr161/lect/earth/magnetic.html

    New Insights Into Origin Of Earth's Magnetic Field
    http://www.sciencedaily.com/releases/2007/03/070309103129.htm

    The Dynamo Effect
    http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magearth.html#c2

    See also
    http://science.nasa.gov/science-news/science-at-nasa/2003/29dec_magneticfield/
     
  6. May 2, 2010 #5
    Re: gravitation

    We believe the outer layers of the planet are solid but the core is liquid because the outer layers can transmit both types of seismological waves - S waves and P waves, but the core can only transmit P waves.
    Solids can transmit both types of wave but liquids cannot.
    P waves stands for pressure wave and S waves stands for shear waves. Liquids cannot support shear, only pressure.
     
  7. May 2, 2010 #6
    Re: gravitation

    Okay, so why did you title this thread "gravitation"? That's completely different from magnetics!

    The Earth's magnetic field is due to the swirling around of liquid iron in the outer core.

    Yes, but only the outer core is liquid, the inner core is solid.
     
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