Talk:Transition zone (Earth)
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Citation of some standard references would be useful. DoctorTerrella (talk) 15:38, 11 November 2014 (UTC)
Technical abbreviations need more description
[edit]Specifically, what are "PP-" and "SS precursors" and "P to S conversions" Father-science (talk) 02:24, 30 December 2022 (UTC)