Which of the following is the major source of energy for Earth?

The major source of energy for Earth is the Sun's energy. The Sun provides the primary source of energy that drives many processes on our planet. Solar energy is essential for photosynthesis in plants, allowing them to convert sunlight into chemical energy, which forms the basis of food webs. Additionally, the Sun's energy influences climate and weather patterns, powering systems like wind and ocean currents.

Solar energy is ultimately responsible for heating the Earth’s surface, affecting the atmosphere, and providing the energy necessary for the formation of fossil fuels and other natural resources. All other forms of energy utilized on Earth, such as wind, hydrothermal, and geothermal energy, are essentially derived from solar energy. Therefore, understanding the pivotal role of the Sun in Earth's energy systems highlights why it is considered the major source of energy for the planet.