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(mander.xyz)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.
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But that part is true. We see these huge seismic anomalies at the core-mantle boundary that many think is a "slab graveyard" (e.g. https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GC009396 ).
Also pieces of the planet that hit Earth to make the moon.
We do not know for certain.