5. Which is not a source of interior heat of the earth
A. the heat from when the planet formed B. gravitational contraction of the earth's interior
C. the radioactive decay of unstable isotope
D. the expansion of the earths core
A. the heat from when the planet formed B. gravitational contraction of the earth's interior
C. the radioactive decay of unstable isotope
D. the expansion of the earths core
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Answer:
C. the radioactive decay of unstable isotope
Explanation:
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