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Alden, A. (2015a). The Earth’s crust. Retrieved from
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Alden, A. (2015b). Six things to know about the Earth’s mantle. Retrieved from http://geology.about.com/od/mantle/tp/mantleintro.htm
Asthenosphere. (2015). Encyclopædia Britannica. Retrieved from http://www.britannica.com/science/asthenosphere
Asthenosphere. (n.d). Dictionary.com Unabridged. Retrieved from http://dictionary.reference.com/browse/asthenosphere
Britt, R. R. (2015). Solar system planets: Order of the 8 (or 9) planets. Retrieved from http://www.space.com/16080-solar-system-planets.html
Choi, C. Q. (2014). Planet Earth: Facts about its orbit, atmosphere & size. Retrieved from http://www.space.com/54-earth-history-composition-and-atmosphere.html
MITK12Videos. (2012). Layers of the Earth. Retrieved from https://www.youtube.com/watch?v=NAHY6965o08&feature=youtu.be
National Geographic. (2015a). Core. Retrieved from http://education.nationalgeographic.com/education/encyclopedia/core/?ar_a=1
National Geographic. (2015b). Crust. Retrieved from http://education.nationalgeographic.com/education/encyclopedia/crust/?ar_a=1
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National Geographic. (2015d). Mantle. Retrieved from http://education.nationalgeographic.com/education/encyclopedia/mantle/?ar_a=1
National Geographic Kids. (2015). Structure of the Earth! Retrieved from http://www.ngkids.co.uk/science-and-nature/structure-of-the-earth
Lunine, J. I. (2015). Earth: The interior. In Encyclopædia Britannica. Retrieved from http://www.britannica.com/place/Earth/The-interior
Robertson, E. (2015). The interior of the Earth. Retrieved from http://pubs.usgs.gov/gip/interior/
Temming, M. (2014). What are the smallest and largest planets in our solar system? Retrieved from http://www.skyandtelescope.com/astronomy-resources/smallest-and-largest-planets-in-our-solar-system/
The Planets. (2015). Earth facts. Retrieved from http://theplanets.org/earth/