the NASA Marshall Space Flight Center
Visit this NASA site to find out about long-term changes in Earth's magnetic field, and how magnetic stripes in the Atlantic seafloor provide evidence for reversals of this field. You'll see a model of Earth's interior that helps explain how Earth's magnetic field is generated and how the reversals occur. Also, a computer-generated image shows the complicated magnetic field in-between reversals.
NASA Marshall Space Flight Center. Earth's Inconstant Magnetic Field. Huntsville: NASA Marshall Space Flight Center. http://science.nasa.gov/science-news/science-at-nasa/2003/29dec_magneticfield/ (accessed 23 June 2017).
Earth's Inconstant Magnetic Field. Huntsville: NASA Marshall Space Flight Center. NASA Marshall Space Flight Center. 23 June 2017 <http://science.nasa.gov/science-news/science-at-nasa/2003/29dec_magneticfield/>.
%0 Electronic Source %T Earth's Inconstant Magnetic Field %I NASA Marshall Space Flight Center %V 2017 %N 23 June 2017 %9 text/html %U http://science.nasa.gov/science-news/science-at-nasa/2003/29dec_magneticfield/
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