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What is the ultimate non-solar source of geothermal heat?

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By TheQuizWire

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Last Updated 01 Dec 2025

A. Residual formation heat

B. Tectonic friction

C. Deep-sea pressure

D. Radioactive decay of isotopes

Continuous radioactive decay of elements like uranium and thorium provides the long-term heat source for geothermal energy.

📚 Topics: Environment and Conservation Renewable Energy

🎯 Exams: CSS GEN PMS

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