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?
http://scienceblogs.com/startswithabang/2011/09/28/why-does-the-earth-have-a-liqu/

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?
http://www.quora.com/Why-are-the-inner-planets-rocky-and-the-middle-planets-large-gas-giants

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

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Tags
earth structure, the earth

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