The National Geographic Magazine, Volume 114National Geographic Society, 1958 - Geography Indexes kept up to date with supplements. |
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Page 238
... carbon - 14 . The relative number of carbon - 14 atoms , compared with normal carbon - 12 , is extremely small . In living wood , for example , only one out of a trillion ( million million ) carbon atoms is radioactive . Only through ...
... carbon - 14 . The relative number of carbon - 14 atoms , compared with normal carbon - 12 , is extremely small . In living wood , for example , only one out of a trillion ( million million ) carbon atoms is radioactive . Only through ...
Page 240
... carbon - 14 and hydrogen . Neutron Nitrogen atom Carbon - 14 O Hydrogen Carbon - 14 combines with oxygen to become carbon dioxide contain- ing carbon - 14 . It diffuses throughout the atmosphere . Vegetation absorbs carbon dioxide ...
... carbon - 14 and hydrogen . Neutron Nitrogen atom Carbon - 14 O Hydrogen Carbon - 14 combines with oxygen to become carbon dioxide contain- ing carbon - 14 . It diffuses throughout the atmosphere . Vegetation absorbs carbon dioxide ...
Page 247
... carbon as they breathe in carbon dioxide . Snails eat the leaves , and their constantly changing body tissues in turn assimilate a higher proportion of carbon - 14 . But the shells , which do not change , reflect the smaller amounts of ...
... carbon as they breathe in carbon dioxide . Snails eat the leaves , and their constantly changing body tissues in turn assimilate a higher proportion of carbon - 14 . But the shells , which do not change , reflect the smaller amounts of ...
Contents
Poseidons Playground Sailing in Grecian waters sprinkled with | 281 |
New Atlas Map Links Roman and Atomic Times in the British Isles Text | 286 |
New Atlas Map Portrays Greece and the Aegean Text accompanying | 295 |
Copyright | |
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