explain Oxygen cycle in brief in 50 words
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The oxygen cycle is the biogeochemical cycle of oxygen within its four main reservoirs: the atmosphere (air), the total content of biological matter within the biosphere (the global sum of all ecosystems), the hydrosphere (the combined mass of water found on, under, and over the surface of planet Earth), and the lithosphere/Earth's crust. The main driving factor of the oxygen cycle is photosynthesis, which is responsible for the modern Earth's atmosphere and life on Earth (see the Great Oxygenation Event).By far the largest reservoir of Earth's oxygen is within the silicate and oxide minerals of the crustand mantle (99.5% by weight). The Earth's atmosphere, hydrosphere and biosphere together weigh less than 0.05% of the Earth's total mass. Oxygen is one of the most abundant elements on Earth and represents a large portion of each main reservoir:
Atmosphere is 21% oxygen by volume present mainly as free oxygen molecules (O2) with other oxygen-containing molecules including ozone (O3), carbon dioxide (CO2), water vapor (H2O), and sulfur and nitrogen oxides (SO2, NO, N2O, etc.)Biosphere is 22% oxygen by volume present mainly as a component of organic molecules (CxHxNxOx) and water moleculesHydrosphere is 33% oxygen by volume present mainly as a component of water molecules with dissolved molecules including free oxygen and carbonic acids (HxCO3)Lithosphere is 94% oxygen by volume present mainly as silica minerals (SiO2) and other oxide minerals
Movement of oxygen between the reservoirs is facilitated in large part by the presence of atmospheric free oxygen. The main source of atmospheric free oxygen is photosynthesis, which produces sugars and free oxygen from carbon dioxide and water:
{\displaystyle \mathrm {6\ CO_{2}+6H_{2}O+energy\longrightarrow C_{6}H_{12}O_{6}+6\ O_{2}} }
Photosynthesizing organisms include the plant life of the land areas as well as the phytoplanktonof the oceans. The tiny marine cyanobacterium Prochlorococcus was discovered in 1986 and accounts for more than half of the photosynthesis of the open ocean.[1]
Atmosphere is 21% oxygen by volume present mainly as free oxygen molecules (O2) with other oxygen-containing molecules including ozone (O3), carbon dioxide (CO2), water vapor (H2O), and sulfur and nitrogen oxides (SO2, NO, N2O, etc.)Biosphere is 22% oxygen by volume present mainly as a component of organic molecules (CxHxNxOx) and water moleculesHydrosphere is 33% oxygen by volume present mainly as a component of water molecules with dissolved molecules including free oxygen and carbonic acids (HxCO3)Lithosphere is 94% oxygen by volume present mainly as silica minerals (SiO2) and other oxide minerals
Movement of oxygen between the reservoirs is facilitated in large part by the presence of atmospheric free oxygen. The main source of atmospheric free oxygen is photosynthesis, which produces sugars and free oxygen from carbon dioxide and water:
{\displaystyle \mathrm {6\ CO_{2}+6H_{2}O+energy\longrightarrow C_{6}H_{12}O_{6}+6\ O_{2}} }
Photosynthesizing organisms include the plant life of the land areas as well as the phytoplanktonof the oceans. The tiny marine cyanobacterium Prochlorococcus was discovered in 1986 and accounts for more than half of the photosynthesis of the open ocean.[1]
vinaymenon007:
Don't copy from Wikipedia bro..
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it is a biochemical cycle that describes the movement of oxygen within its 3 main reservoirs the atmosphere the total content of biological matter within the biosphere and the the lithosphere . failures in the oxygen cycle within the hydrospehre found on uder and over the surface of planet can result in development of hypoxic zones
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