The most common element on Earth is hydrogen. Hydrogen is a chemical element with the symbol H and atomic number 1. It is the lightest and most abundant element in the universe, making up about 75% of its elemental mass. It is estimated that hydrogen constitutes approximately 90% of all atoms in the universe.

Hydrogen is found in a wide variety of compounds on Earth, including water (H2O), hydrocarbons, and organic matter. It is also present in the Earth's atmosphere, primarily in the form of diatomic molecules (H2). Due to its high reactivity, hydrogen is rarely found in its pure elemental form on Earth.

The abundance of hydrogen on Earth can be attributed to its formation during the Big Bang, the event that is believed to have given birth to the universe. During the early stages of the universe's evolution, hydrogen was produced in large quantities as protons and neutrons combined to form atomic nuclei. As the universe expanded and cooled, these atomic nuclei eventually combined to form hydrogen atoms.

Hydrogen plays a crucial role in various natural processes on Earth. It is involved in the production of energy through fusion reactions in stars, including our Sun. Hydrogen is also an essential component of water, which is vital for all known forms of life. Additionally, hydrogen is used as a fuel in various industries and has the potential to be a clean and sustainable energy source in the future.

In conclusion, hydrogen is the most common element on Earth. Its abundance can be attributed to its formation during the Big Bang and its involvement in various natural processes. Understanding the properties and behavior of hydrogen is important for scientific research and has significant implications for energy production and sustainability.

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