How is C-14 created in our atmosphere?
a. The photosynthetic process of plants produces C-14 as a by product.
b. Cosmic rays bombard our upper atmosphere and cause N-14 to decay into C-14.
c. It is produced by the decay of C-15.
d. C-14 is a industrial pollutant created by the combustion of fossil fuels
http://en.wikipedia.org/wiki/Carbon-14#Origin_and_radioactive_decay
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