Multiple Choice
What is the source of natural carbon-14?
A) nuclear fission of the heavy, radioactive elements uranium and thorium
B) fusion of hydrogen and helium in the Sun and eruption of solar flares
C) leakage of radioactive gases from the liquid, outer core
D) cosmic ray collisions triggering "neutron-capture" in ordinary atmospheric nitrogen
Correct Answer:
Verified
Correct Answer:
Verified
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