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In nature, phosphorous is found mostly in the form of phosphate ions—\text {PO}_4^{3-}PO​4​3−​​P, O, start subscript, 4, end subscript, start superscript, 3, minus, end superscript. Phosphate compounds are found in sedimentary rocks, and as the rocks weather—wear down over long time periods—the phosphorous they contain slowly leaches into surface water and soils.

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The nitrogen cycle is a continuous series of natural processes by which nitrogen passes successively from air to soil to organisms and back to air or soil involving principally nitrogen fixation, nitrification, decay, and denitrification.

Process: Nitrogen Fixation- Special bacteria convert the nitrogen gas (N2 ) to ammonia (NH3) which the plants can use. Step 2- Nitrification- Nitrification is the process which converts the ammonia into nitrite ions which the plants can take in as nutrients.

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This is a short introduction to the natural Nitrogen Cycle. For further information about Nitrogen, click here: http://www.stickstoffausstellung.de/1/news/exhibition-location/ Thanks a lot to Cassandra for helping me with the translation! :) And thank you for the music, j.lang! Music: "Drops of H2O ( The Filtered Water Treatment )" by J.Lang (feat.

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The  processes by which carbon compounds are inter-converted in the environment,  involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.

The process in which carbon travels from the atmosphere into organisms and the Earth and then back into the atmosphere. Plants take carbon dioxide from the air and use it to make food. Animals then eat the food and carbon is stored in their bodies or released as CO2 through respiration.

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The water cycle is of processes by which water circulates between the earth's oceans, atmosphere, and land, involving precipitation as rain and snow, drainage in streams and rivers, and return to the atmosphere by evaporation and transpiration.

Water is an essential for life on earth. Nothing would be able to live without water.

Evaporation, condensation, and precipitation are the processes of the water cycle.

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Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.

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Water Cycle | How the Hydrologic Cycle Works