We've been to the moon but we've barely scratched the surface of our own planet! Trace explains what it would take for humans to see into the center of the Earth and why we haven't yet made the trek.
via Discovery News http://news.discovery.com/earth/videos/mystery-of-earth-core-explained-video.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/earth/videos/mystery-of-earth-core-explained-video.htm#mkcpgn=rssnws1
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