The National Geographic Magazine, Volume 105National Geographic Society, 1954 - Geography Indexes kept up to date with supplements. |
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Page 83
... plants , it has been found , use phos- phorus from fertilizers in the first stages of growth , but later draw most ... plants grow in controlled air containing carbon dioxide tagged with radioactive carbon . " Plants in the greenhouse ...
... plants , it has been found , use phos- phorus from fertilizers in the first stages of growth , but later draw most ... plants grow in controlled air containing carbon dioxide tagged with radioactive carbon . " Plants in the greenhouse ...
Page 84
... plants contains radioactive carbon . When animals or humans eat the plants , the isotope enters their bodies . During life it gives off an average 16 rays a minute per gram of carbon . At death its radioactivity begins to slow down at a ...
... plants contains radioactive carbon . When animals or humans eat the plants , the isotope enters their bodies . During life it gives off an average 16 rays a minute per gram of carbon . At death its radioactivity begins to slow down at a ...
Page 410
... plant which now drifts about in vast quan- tities in the Sargasso Sea cannot be identified with any known land - fast species . Scientists increasingly hold the view that the drifting plants can maintain themselves indefinitely by ...
... plant which now drifts about in vast quan- tities in the Sargasso Sea cannot be identified with any known land - fast species . Scientists increasingly hold the view that the drifting plants can maintain themselves indefinitely by ...
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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