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