Question

4 isotopes as main source of radioactive heat

Answer 1

Answer:

The radioactive isotopes uranium-235 (235U), uranium-238 (238U), potassium-40 (40K), and thorium-232 (232Th) in Earth's mantle are the primary source. Radioactive decay produced more heat early in Earth's history than it does today, because fewer atoms of those isotopes are left today (Figure 3.14).

Explanation:

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Answer 2

Answer:

hi

Explanation:

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