As an expert in the field of environmental science and energy resources, I can provide a comprehensive answer to the question of the ultimate source of energy on our planet.

The sun is the primary and most significant source of energy for the Earth. It is a massive ball of gas, primarily hydrogen and helium, undergoing nuclear fusion at its core. This process releases an enormous amount of energy in the form of light and heat, which travels through space and reaches our planet. The sun's energy is the driving force behind the Earth's climate and weather systems, and it is the foundation of the planet's ecosystems.

The biosphere, which encompasses all living organisms and their interactions with the environment, relies heavily on solar energy. Photosynthesis, a process carried out by plants, algae, and some bacteria, is the primary means by which solar energy is converted into chemical energy. This chemical energy is stored in the form of glucose and other organic compounds, which are then used by the organisms themselves and also serve as a food source for other organisms in the food chain.

The hydrosphere, which includes all the water on Earth, is also influenced by the sun's energy. Solar radiation causes water to evaporate, forming clouds, and drives the water cycle. This cycle is essential for the distribution of water and nutrients across the planet, supporting life in various ecosystems.

The atmosphere is warmed by the sun's energy, which is critical for maintaining a temperature range that is hospitable for life. The sun's rays also play a role in the formation of the ozone layer, which protects the Earth from harmful ultraviolet radiation.

While the sun is the primary source of energy for life on Earth, there are other sources of energy that are significant in different contexts. The Earth's core and mantle contain heat energy generated by the decay of radioactive isotopes. This heat drives plate tectonics, the movement of the Earth's crust, which can lead to volcanic activity and earthquakes. The heat from the Earth's interior is also harnessed by humans for geothermal energy, which is used to generate electricity and provide heating.

In summary, the sun is the ultimate source of energy for nearly all life on Earth. It powers the biosphere, hydrosphere, and atmosphere, and its energy is essential for the existence and sustenance of life. Other sources of energy, such as geothermal energy from the Earth's core, are also important but are secondary in comparison to the sun's role.

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"What is the source of energy for nearly all life on Earth?" Basically, the sun powers the biosphere, the hydrosphere, atmosphere, and makes life on Earth possible. Heat energy from the Earth's core and mantel drive plate tectonics. This same heat energy is used by humans for geothermal energy.Mar 13, 2016read more >>