Sources of heat for geothermal energy are A. Radioactive decay of unstable elements B. Nuclear fusion…
Geothermal heat comes from the radioactive decay of unstable isotopes in the crust and mantle, from magma bodies rising towards the surface, and from the general geothermal…
Choose your answer
Sources of heat for geothermal energy are
A. Radioactive decay of unstable elements
B. Nuclear fusion
C. Magma
D. Temperature gradient inside earth
E. Oceanic circulation
Answer and explanation
Correct answer C
Geothermal heat comes from the radioactive decay of unstable isotopes in the crust and mantle, from magma bodies rising towards the surface, and from the general geothermal gradient of the Earth's interior. Nuclear fusion occurs in stars, not inside the Earth, and oceanic circulation only redistributes surface heat. Hence A, C and D only.
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