Unformatted text preview: 7. Meteorites tell us that the earth formed near many other planetismals which broke apart and left behind meteorites. 9. The core used to be hotter due to the abundance of decaying radioactive elements. 10. It is hypothesized that once the oceanic crust was formed it was subjected to further partial melting which makes it appear younger, and the continental crust was not subjected to such melting so it appears older....
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- Fall '08
- Planet, continental crust, oceanic crust, Joe Littman, dense silicate, dense metallic