Multiple Choice
Present day heat flow from within Earth is twice as high as could be expected from radioactivity's contribution. This suggests that
A) more radioactivity is occurring than what scientists have accounted.
B) volcanic action contributes more than scientists presently understand.
C) Earth used to be much hotter.
D) movement within the core causes heating by friction.
Correct Answer:
Verified
Correct Answer:
Verified
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