![Inthe1960s，whilestudyingthevolcanichistoryofYellowstone...]( "Inthe1960s，whilestudyingthevolcanichistoryofYellowstone...")
- 問題詳情：Inthe1960s，whilestudyingthevolcanichistoryofYellowstoneNationalPark，BobChristiansenbecamepuzzledaboutsomethingthat，oddly，hadnottroubledanyonebefore：hecouldn'tfindthepark'svolcano.IthadbeenknownforalongtimethatYellowstonewasvolcanicinnature—that...
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