The National Geographic Magazine, Volume 105National Geographic Society, 1954 - Geography Indexes kept up to date with supplements. |
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Page 84
84 Life's Built - in Atomic Clock , Radioactive Carbon , Dates Ancient Remains Carbon dioxide absorbed from air by plants contains radioactive carbon . When animals or humans eat the plants , the isotope enters their bodies . During ...
84 Life's Built - in Atomic Clock , Radioactive Carbon , Dates Ancient Remains Carbon dioxide absorbed from air by plants contains radioactive carbon . When animals or humans eat the plants , the isotope enters their bodies . During ...
Page 85
... radioactive , proving they fed upon their hosts . Sterility a Weapon Against Flies In most southern States , and at times in other parts of the country , cattle and other domestic and wild animals are attacked by the vicious screwworm ...
... radioactive , proving they fed upon their hosts . Sterility a Weapon Against Flies In most southern States , and at times in other parts of the country , cattle and other domestic and wild animals are attacked by the vicious screwworm ...
Page 86
... radioactive materials in transit pose a serious weight problem in aircraft . But unguarded rays separated by the ... radioactive material . Clicks from the counter , relayed to the surface , tell when the acid has risen in the well to ...
... radioactive materials in transit pose a serious weight problem in aircraft . But unguarded rays separated by the ... radioactive material . Clicks from the counter , relayed to the surface , tell when the acid has risen in the well to ...
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ALEXANDER WETMORE American amphorae Anthony Stewart Aqualung atomic energy Basque Baylor Roberts beach Bermuda birds blue boat breed built California Calypso camera Campanian Canyon century cliff climb coast color Creek Delos Dinosaur dishes divers dogs East feet fish gardens Geiger counter Geographic Society Kodachromes goats Grand Congloué Greek green harbor Highway hills honey-guide Hong Kong Ischia island Justin Locke Kodachromes by National La Verkin land live looked MELVILLE BELL GROSVENOR miles mountains Myojin National Geographic Magazine National Geographic Photographer National Geographic Society National Geographic Staff National Park Navy nest neutrons night Peak plants Port radioactive rock Saar sauropod Sestius ship shore Sierra stream street Tollund town trail trees turned uranium Valley Virgin River visitors VOLKMAR WENTZEL walls watched West wine Zion National Park