Small Quantities of Long-Lived Radioactive Isotopes Within the Earth, Principally

question 9

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 ​

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