Most of the sources of energy we use represent stored solar energy. Which of the following is not ultimately derived from the Sun’s energy?
$(a)$ geothermal energy
$(b)$ wind energy
$(c)$ nuclear energy
$(d)$ bio-mass.

Correct Answer is : $(b)$ geothermal energy


Geothermal energy$\rightarrow$
Geothermal energy is the heat energy obtained from hot rocks present inside the earth due to the fission of radioactive materials in it. So, it does not come directly or indirectly from the sun's energy.
The term Geothermal is derived from the two Greek words, 'Geo' meaning "earth" and 'thermal' meaning "heat".

Production of geothermal energy$\rightarrow$
Geothermal energy is the heat produced deep in the Earth's core, which is a clean, renewable source of energy that can be harnessed for use as heat and electricity. The heat in the core is produced mainly by the radioactive decay of potassium, thorium, and uranium in Earth’s crust and mantle and also by friction generated along the margins of continental plates.
So, geothermal energy is not ultimately derived from the Sun’s energy.

While wind energy, nuclear energy, and bio-mass energy are derived from the sun's energy.

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