What are the main sources of Earth’s internal heat engine?

Correct Answer: Radiogenic heat and primordial heat

Subject: geography

• Solar heat and oceanic tides
• Radiogenic heat and primordial heat
• Heat from volcanoes and solar heat
• Friction from tectonic plates only

Explanation: • The Earth’s internal heat comes from the decay of radioactive isotopes (Radiogenic). • It also comes from primordial heat left over from the planet’s fiery formation. • This heat is the source of Geothermal Energy. • Solar heat affects the surface, not the internal engine deep in the core. • Trick: 'Radio-Prime Core' (Radiogenic + Primordial). • Geothermal energy is extracted at places like Puga Valley and Manikaran.

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