earth's crust

    Article

    The earth is made of multiple layers of hardened and liquid rocks, which include, moving from the exterior of the planet toward the interior, the crust, mantle, outer core, and inner core. The crust is the hardened outer layer of rock composed primarily of silicate and iron.

    Photo Credit

     
    "The internal structure of Earth" by Kelvinsong is licensed under CC BY-SA.

    Term Type
    References

     
    Pidwirny, M.
         2013   Structure of the Earth. http://www.eoearth.org/view/article/156285, accessed
             December 5, 2014.