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The interior of our planet is one of the last 'terra incognita'. Its chemical composition and onion-like structure of solid rocks and rare minerals make it a fascinating object. It is primarily its dynamic that makes Earth such a singular object in the solar system, with perennial, active plate tectonics for several billion years.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.