Multiple Choice
Small quantities of long-lived radioactive isotopes within the earth, principally _____, give off roughly 30 trillion watts of heat.
A) potassium 40 and uranium 235
B) uranium 235 and uranium 238
C) u ranium 238 and thorium 232
D) thorium 232 and potassium 40
Correct Answer:
Verified
Correct Answer:
Verified
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