The gold we find on Earth did not come from our planet’s rocky crust. It was actually cooked up in space and is present on Earth because of cataclysmic stellar explosions called supernovae. So gold is really extraterrestrial! (4:34 min.)

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with Starting Points

Bill Nye follows the development of the theory of Plate Tectonics by looking at the evidence for the mechanism that moves the plates and provides support for this theory.(4:07 min.)

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