What is the primary source of energy for Earth?

The primary source of energy for Earth is the Sun. This energy is essential for the processes that sustain life on our planet, such as photosynthesis in plants, which forms the basis of food chains. Solar energy drives weather patterns and ocean currents, influencing climates around the globe.

While volcanic activity releases geothermal energy, it is not the main source of energy that powers Earth’s systems. The Moon affects Earth primarily through gravitational interactions, which influence tides but do not provide a significant energy source. Wind, on the other hand, is a result of solar energy heating the Earth's surface unevenly and creating pressure differences in the atmosphere; it cannot be considered a primary energy source on its own.

In summary, the Sun’s energy is central to all ecological and atmospheric processes on Earth, making it the indispensable primary source of energy for the planet.