探求犬ひまちゃん 
ダグラス・フォークトの研究でわかったポールシフトと地球災害
動画生成: NoLang (no-lang.com)
Ukraine geology by Alex Tora CC BY-SA 3.0
Merzhanovo, Geology, Deposits, Russia by Vyacheslav Argenberg CC BY 4.0
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