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Hydrothermal waters in Yellowstone National Park carry radium to the Earth's surface, but not in quantities harmful to visitors.

United statesJoann hollowayMarie curieHermon schlundtHenry becquerelAndrew millerNeil sturchioKen simsPierre curieYellowstone national park duringUniversity of delawareUs geologicalUniversity of missouriYellowstone national park angel terraceYellowstone national parkYellowstone caldera chronicles