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 .
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 .
Page 85
Radioactivity also helps prove that certain . insects prey on others and thus can help in controlling pests . ... They fed radiophosphorus to roaches , then found the mites also became radioactive , proving they fed upon their hosts .
Radioactivity also helps prove that certain . insects prey on others and thus can help in controlling pests . ... They fed radiophosphorus to roaches , then found the mites also became radioactive , proving they fed upon their hosts .
Page 86
ER OUR Radioisotopes Ride Harmlessly in a Plane's Wingtip Heavy lead boxes normally used to shield radioactive materials in transit pose a serious weight problem in aircraft . But unguarded rays separated by the length of the wing offer ...
ER OUR Radioisotopes Ride Harmlessly in a Plane's Wingtip Heavy lead boxes normally used to shield radioactive materials in transit pose a serious weight problem in aircraft . But unguarded rays separated by the length of the wing offer ...
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Contents
Britains Fabulous Crown Colony on the South China | 1 |
Scotlands Golden Eagles at Home Climbing Perilous Cliffs to Lofty Eyries | 9 |
Sierra High Trip Hikers Follow Flowery Trails in an Unspoiled | 14 |
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Address American atomic Beach beautiful Bermuda bird blue boat body breed building built called camera Canyon carry century City cliff color Company cover divers dogs early East energy enjoy feet field fish give green hand head Hill identifies Illustrations island Italy Kodachromes land later lead light living looked Michigan miles Mountain moved National Geographic Magazine National Geographic Society natural night North once Park Photographer plants Port production radioactive River road Robert rock ship side South stream Street trip turned United vacation Valley walls Washington watched West Write York Zion
Bibliographic information
| Title | The National Geographic Magazine, Volume 105 The National geographic magazine, National Geographic Society (U.S.) |
| Contributor | National Geographic Society (U.S.) |
| Publisher | National Geographic Society, 1954 |
| Original from | the University of Michigan |
| Digitized | 20 Feb 2009 |
| Export Citation | BiBTeX EndNote RefMan |