Which energy source provides most of Earth's energy?

• A. The wind.
• B. Fossil fuels.
• C. The sun.
• D. Geothermal.

Answer: (C)

The sun provides most of Earth’s energy. It delivers a vast and continuous input that powers climate, weather, and photosynthesis, which in turn fuels nearly all life and many processes on the planet. The wind is a movement of air caused by solar heating and atmospheric circulation, so it’s driven by solar energy and represents only a small portion of the total energy input. Fossil fuels are ancient stores of solar energy, not a direct ongoing source, and geothermal energy comes from Earth’s internal heat, which is much smaller in comparison to solar input. So, the sun is the primary energy source fueling Earth.