Why is large-scale nuclear fission a rare phenomenon on earth? a. there isn't enough energy to start a chain reaction in nature. b. there are no naturally occurring atoms that can undergo fission left on earth. c. atoms that undergo fission aren't concentrated enough to sustain a chain reaction. d. atoms that undergo fission tend to decay more slowly on earth than in stars.

The answer is; C

The radioisotopes in the interior of the earth are not in pure form and have many embedded impurities and are interspersed. Therefore when a neutron is released by a decaying atom, its chances of hitting another radioisotope atom (to continue the chain reaction) are lower than in a manmade nuclear reactor. This way, the radioactive chain reaction in the earth’s interior is not well sustained.

the answer is c

tell me if wrong