Oxygen cycle: Learn how oxygen is cycled

Learn how oxygen is cycled through the atmosphere, biosphere, hydrosphere and lithosphere by biological and geological processes. Find out the main sources and sinks of oxygen, the capacities and fluxes of each reservoir, and the history of oxygen evolution on Earth. What is an Oxygen Cycle? The oxygen cycle is a biological process that helps maintain the level of oxygen through three main spheres of the earth, including: Atmosphere (layer of gases presents above the earth’s surface) Lithosphere (solid outer section along with the earth’s crust) (ecosystem together build biosphere) In other words, it is the cycle that helps to move oxygen through the three central regions of the earth, i.e., the Atmosphere, the biosphere, and the Lithosphere. If we ... The oxygen cycle is the continuous movement of oxygen atoms through the Earth's main systems: the atmosphere (air), the biosphere (living organisms), and the lithosphere (Earth's crust). Learn about the Oxygen Cycle – its definition, key examples like photosynthesis and respiration, uses in biology, how oxygen is produced, and interesting facts about this important element.