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Definition of Oxygen Oxygen a colorless, odorless, tasteless gas

Denser than air

-Oxygen is found on Earth as a gas and constitutes about 21% of the air we breathe. Elemental molecular oxygen consists of two oxygen atoms bonded together.

What is the Oxygen Cycle?In the oxygen cycle, oxygen atoms present in the earth circulate through a series of intricate processes. Like the nitrogen, carbon, and water cycles, the oxygen cycle is a biogeochemical cycle.A biogeochemical cycle is the movement of matter through the biotic and the abiotic spheres of the ecosystem.In the oxygen cycle, oxygen atoms present in the earth circulate through a series of intricate processes. Like the nitrogen, carbon, and water cycles, the oxygen cycle is a biogeochemical cycle.A biogeochemical cycle is the movement of matter through the biotic and the abiotic spheres of the ecosystem.

Steps in oxygen cyclePhotosynthesisRespirationReleased of CO2

Step One of Oxygen Cycle

oxygenPlant release oxygen into the atmosphere as a by-product of photosynthesis.

Photosynthesis Plants take in carbon dioxide and water and use them to make food. Their food is simple sugar glucose.7RespirationProcess by which an organism exchanges gases with its environment

Process oxygen is abstracted from air, transported to cells for the oxidation of organic molecules while CO2 and H2O, the products of oxidation, are returned to the environment

Animals take in oxygen through the process of respiration.

Animals then break down sugars and food.

The process that breaks apart simple food molecules to release energy.

9Respiration in CellsIn your cells, oxygen is used to split glucose apart releasing energy, water and carbon dioxide.

10Step Three in Oxygen CycleCarbon dioxide is released by animals and used in plants in photosynthesis. Oxygen is balanced between the atmosphere and the ocean.