Page 2 of 12
3. Of the three isotopes of carbon, which is most abundant and which is radioactive?
  C-12 & C-13
  C-13 & C-14
  C-14 & C-12
  C-12 & C-14
  no way to know
4. Generated in the upper atmosphere, C-14 makes up only 0.00000000010% of all carbon atoms. This is the same as 1 atom of C-14 per every____ atoms of Carbon.
  1 thousand
  1 million
  1 Billion
  1000 Billion or 1 Trillion
  no way to know

Copyright © 1998-2019 Virtual Courseware Project