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The Core released to audiences 20 years ago. Ever since, audiences have bemoaned, laughed at and loved the loose use of geological science in the film. PictureLux/The Hollywood Archive/Alamy hide caption

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PictureLux/The Hollywood Archive/Alamy

What scientists love and lament when Hollywood journeys to Earth's core

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Stanford University/Getty Images

Zircon: The Keeper Of Earth's Time

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A thin, polished slice of a rock collected from the Jack Hills of Western Australia, viewed through a special microscope equipped with a gypsum plate that shows the rainbow spectrum of quartz that makes up the rock. Whereas the rocks at the Jack Hills are greater than 99% quartz, the remaining 1% of material includes the precious zircons. Michael Ackerson/Smithsonian hide caption

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Michael Ackerson/Smithsonian

To peer into Earth's deep time, meet a hardy mineral known as the Time Lord

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