Answer:
heat from the decay of radioactive elements.
frictional heating, caused by denser core material sinking to the center of the planet
Explanation:
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The question is referring to a contrast so the proper phrase would be "on the other hand". This phrase means something along the lines of "looking at the other side" which refers to the other situation or event.In fact means giving a true exampleIn other societies means examples of ideas from other placesFor example is just giving an exampleHope this helped :)
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