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Why Does The Earth Have Layers?

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 Geology   |   Physics   |   Science
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…or why we live on an onion made of magma.
Subscribe to It’s Okay To Be Smart: http://bit.ly/iotbs_sub
↓ More info and sources below ↓
Follow on Twitter: http://twitter.com/jtotheizzoe
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Follow on Instagram: http://instagram.com/jtotheizzoeThanks 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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Have an idea for an episode oran amazing science question you want answered? Leave a comment below!

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Produced by PBS Digital Studios: http://www.youtube.com/user/pbsdigitalstudios

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

Theme music:
“Ouroboros” by Kevin MacLeod

Stock images via Shutterstock
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Last week’s video: Why do clouds stay up? http://www.youtube.com/watch?v=DjByja9ejTQ

More videos:
The Physics of Space Battles http://www.youtube.com/watch?v=ZFOuxAx-dkc
Why Did We Blow on NES Games? http://www.youtube.com/watch?v=4Gf9mtXnJfM
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

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