Why Does The Earth Have Layers?

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…or why we live on an onion made of magma
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Thanks to Miles Traer and Mike Osborne for geophysics help on this one!

Why does Earth have a liquid core, and how do we know?

How many pennies would you have to stack to melt the one on the bottom? http://www.reddit.com/r/askscience/comments/2g8jj9/how_many_pennies_need_to_be_stacked_before_the/

Why are the inner planets rocky and the outer ones are gas giants?


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Joe Hanson - Host and writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen IncKate Eads - Associate Producer
Katie Graham - Director of Photography
Andrew Matthews - Editing/Motion Graphics
John Knudsen - Gaffer
Dalton Allen - Post-production Intern

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Last week's video: Why do clouds stay up? http://www.youtube.com/watch?v=DjByja9ejTQ

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The Science of Game of Thrones - http://www.youtube.com/watch?v=Utu-LpJn3Is
The Far Future of the Universe - http://www.youtube.com/watch?v=Jl9DwNOonOA
There Was No First Human - http://www.youtube.com/watch?v=xdWLhXi24Mo
How The Elements Got Their Names - http://www.youtube.com/watch?v=mtg9p6A6xnY
earth structure, the earth

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