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Lower Mantle (Earth).
https://en.wikipedia.org/wiki/Lower_mantle_(Earth)

has been cited by the following article:

• TITLE: Extraterrestrial Impacts and Geomagnetic Reversals

  AUTHORS: Pirooz Mohazzabi, Michael J. Connolly, Julia A. Jones, John D. Skalbeck, Nicholas A. Potter

  KEYWORDS: Earth, Extraterrestrial, Impact, Geomagnetic, Reversal

  JOURNAL NAME: Journal of Applied Mathematics and Physics, Vol.10 No.3, March 31, 2022

  ABSTRACT: The existing data on the confirmed extraterrestrial impacts and geomagnetic reversals are examined. Differential rotation of the inner core of the Earth relative to the rest of the planet has been observed through seismic records. Differential rotation between the inner and outer core is thought to be related to the geomagnetic field of the Earth. Extraterrestrial impacts with the surface of the Earth have been shown to cause changes in this differential rotation. It is shown in this paper that there is a strong correlation between the dates of major impacts and geomagnetic reversals. This strongly supports the possibility of major extraterrestrial impacts being one of the causes of geomagnetic reversals as has been suggested previously.