Oxygen plays an essential part of the life existence of the planet. Oxygen makes around 65 percent of the total mass of the body around 30 percent of the earth and 21 percent of the atmosphere. It is found both in the earth’s crust and also in the atmosphere as carbon dioxide. Oxygen is an important element of the biomolecules like proteins, nucleic acids, etc. Let us talk about the oxygen cycle now.
Oxygen cycle along with carbon cycle and nitrogen cycle plays an important role in the existence of life on earth. Oxygen cycle is a biological process which helps in maintaining the oxygen level by moving through three main regions of the earth which are Atmosphere, Lithosphere, and Biosphere.
It is the biogeochemical cycle which explains the movement of oxygen gas within the atmosphere, the ecosystem biosphere, and the lithosphere.
The atmosphere is the layer of gases presents above the earth’s surface. The sum of all Earth’s ecosystem makes a biosphere. Lithosphere, which is the solid outer section along with the Earth’s crust and it is the largest reservoir of oxygen.
Uses of Oxygen
Basically, Atmospheric oxygen is used for four main processes which include:
Respiration: All living species, from a single bacteria, plants, and animals use oxygen for breathing. It is the metabolic processes in which we inhale oxygen and exhale carbon dioxide.
Decomposition: One of the important steps in oxygen cycle is decomposition in which when an animal dies, it decomposes and it uses all the oxygen and releases carbon dioxide. Oxygen is also used up in rusting as oxidation takes place here.
Combustion: It is also one of the most important processes which are just like burning for which oxygen, fuel, and heat is required. There can be no fire without oxygen and when anything burns it uses the oxygen and replaces it with carbon dioxide in case of hydrocarbons.
Formation of oxides: This process also requires oxygen. It is the formation of oxides which is also called oxidation. Rusting is the best example of oxidation. In this process, metals like iron or alloy rust when they are exposed to moisture and oxygen for a long period of time. New compounds of oxides are formed by the combination of oxygen with the metal.
Production of Oxygen
The main creators of oxygen are plants by the process of photosynthesis.
Photosynthesis is a biological process by which all green plants synthesize their food in the presence of sunlight. During photosynthesis, plants use sunlight, water, and carbon dioxide to create energy. Oxygen is liberated as a by-product of this process.
Some interesting facts about oxygen
- Phytoplankton is one of the biggest sources of oxygen that live near the ocean.
- Fishes also breathe oxygen even under water; their gills extract oxygen from water.
- Oxygen is also produced when the sunlight reacts with water vapor in the atmosphere.
- A large amount of oxygen is stored in the earth’s crust in the form of oxides but we cannot breathe this oxygen as it is in the combined state.
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