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地球の 外側の1/2半径は岩石、内側の1/2半径は金属。 //   ある仮説「ジャイアント・インパクト説」




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読書ノート  清川昌一 伊藤孝 池原実 尾上哲司著 「地球全史スーパー年表」 (岩波書店 2014年) - ブログ 「ごまめの歯軋り」

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