Geoscience
Senior High
地学の問題です(´･ω･｀)
問3と問4がわかりません…
ちなみに答えは
問3:23億年 問4: ②
です
解説をできれば詳しく教えてください、お願いします((｡´･ω･)｡´_ _))ﾍﾟｺﾘ
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