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A Recent Study Suggests Earth’s Core May Be Enveloped By An Ancient Ocean Floor Hosting Mountains, 5x Taller Than Mt. Everest. This Find Comes From The Most Detailed Geological Map Of The Southern Hemisphere, Showing A Vast Ultra-Low Velocity Zone, Likely Containing Subducted Oceanic Materials, Influencing Heat Flow & Geological Activities.

https://futurism.com/the-byte/earth-core-ancient-ocean

The core-mantle boundary is dotted with Everest-dwarfing “mountains” made of ocean floors that were dragged to the interior over millions of years.