- In the Human Body: Oxygen is the third most abundant element in the human body after hydrogen and carbon. It makes up about 65% of our total body weight. Oxygen is essential for life, as it is the gas that our cells use to produce energy.
- In the Earth's Crust: Oxygen is the most abundant element in the Earth's crust, making up about 47% of its weight. It is found in a variety of minerals, including oxides, silicates, and carbonates.
- In the Atmosphere: Oxygen is the second most abundant element in the Earth's atmosphere, after nitrogen. It makes up about 21% of the atmosphere's volume. Oxygen is essential for life, as it is the gas that plants and animals use to breathe.
- In the Ocean: Oxygen is the third most abundant element in the ocean, after hydrogen and chlorine. It makes up about 3% of the ocean's weight. Oxygen is essential for marine life, as it is the gas that fish and other aquatic organisms use to breathe.
