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  • https://bio.libretexts.org/Courses/Gettysburg_College/01%3A_Ecology_for_All/20%3A_Biogeochemical_Cycles/20.04%3A__The_Nitrogen_Cycle
    Human activity can release nitrogen into the environment by two primary means: the combustion of fossil fuels, which releases different nitrogen oxides, and by the use of artificial fertilizers (which...Human activity can release nitrogen into the environment by two primary means: the combustion of fossil fuels, which releases different nitrogen oxides, and by the use of artificial fertilizers (which contain nitrogen and phosphorus compounds) in agriculture, which are then washed into lakes, streams, and rivers by surface runoff.
  • https://bio.libretexts.org/Courses/Gettysburg_College/01%3A_Ecology_for_All/20%3A_Biogeochemical_Cycles/20.06%3A_Eutrophication_and_Dead_Zones
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  • https://bio.libretexts.org/Workbench/General_Ecology_Ecology/Chapter_20%3A_Biogeochemical_Cycles/20.3%3A_Eutrophication_and_Dead_Zones
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  • https://bio.libretexts.org/Courses/Gettysburg_College/01%3A_Ecology_for_All/20%3A_Biogeochemical_Cycles/20.05%3A_The_Phosphorus_Cycle
    The movement of phosphate from the ocean to the land and through the soil is extremely slow, with the average phosphate ion having an oceanic residence time between 20,000 and 100,000 years. Soil and ...The movement of phosphate from the ocean to the land and through the soil is extremely slow, with the average phosphate ion having an oceanic residence time between 20,000 and 100,000 years. Soil and Sustainability and Biogeochemical Cycles and the Flow of Energy in the Earth System from Sustainability: A Comprehensive Foundation by Tom Theis and Jonathan Tomkin, Editors (licensed under CC-BY).

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