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What is the Oxygen Cycle? The oxygen cycle portrays how the flow of oxygen occurs through several parts of our vast ecosystem. Oxygen is found in several parts of the ecosystem, from the air we breathe (Atmosphere), the water bodies on the planet (Hydrosphere), inside all the biological beings (Biosphere) and inside the earth’s crust (Lithosphere). The oxygen cycle involves several key processes that either release or consume oxygen. The main steps are: Photosynthesis: Plants, algae, and phytoplankton use sunlight, water, and carbon dioxide to create food, releasing oxygen as a major by-product into the atmosphere. Respiration: Animals, plants, and most other living organisms take in oxygen from the atmosphere to break down food for energy, releasing carbon dioxide in the process. Decomposition: When organisms die, decomposers like ... The oxygen cycle elaborates how oxygen circulates in various forms through nature. Oxygen occurs freely in the air, trapped in the earth crust as chemical compounds, or dissolved in water. Oxygen in the atmosphere is about 21%, and it is the second most abundant gas after nitrogen. It is mostly utilized by living organisms, especially man and animals in respiration. Oxygen is also the most common element of human body. Oxygen is also used during combustion, decomposition, and oxidation. The ... The oxygen cycle is a fundamental biogeochemical cycle that describes the movement of oxygen within and between the Earth's atmosphere, biosphere, lithosphere, and hydrosphere.
