Answer:
s of the earth: the crust, mantle, outer core, and inner core
Explanation:
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<span>It requires extremely high temperatures to begin the reaction.
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While nuclear fusion involves the union of atoms, fission is the breaking of an atomic nucleus into two smaller parts. For this to happen it is necessary that the atom reaches a very high temperature.
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Answer:
i think the answer is helium (top right in periodic table)