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- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Principles_of_Biology/03%3A_Chapter_3/26%3A_Ecosystems/26.03%3A_Biogeochemical_CyclesThe hydrosphere is the area of the Earth where water movement and storage occurs: as liquid water on the surface and beneath the surface or frozen (rivers, lakes, oceans, groundwater, polar ice caps, ...The hydrosphere is the area of the Earth where water movement and storage occurs: as liquid water on the surface and beneath the surface or frozen (rivers, lakes, oceans, groundwater, polar ice caps, and glaciers), and as water vapor in the atmosphere. Atmospheric sulfur is found in the form of sulfur dioxide (SO 2 ) and enters the atmosphere in three ways: from the decomposition of organic molecules, from volcanic activity and geothermal vents, and from the burning of fossil fuels by humans.
- https://bio.libretexts.org/Courses/Monterey_Peninsula_College/Raskoff_Environmental_Science/02%3A_Environmental_Systems/2.11%3A_Phosphorus_CycleThis page discusses the importance of phosphorus in biological processes and ecosystems. It highlights its role in forming DNA, RNA, and cell membranes, as well as its contribution to bone structure. ...This page discusses the importance of phosphorus in biological processes and ecosystems. It highlights its role in forming DNA, RNA, and cell membranes, as well as its contribution to bone structure. The phosphorus cycle is described, noting natural sources and human impacts, especially through runoff. The problem of eutrophication from excess phosphorus is addressed, detailing its harmful effects on aquatic life and the creation of dead zones in water bodies.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_(Boundless)/46%3A_Ecosystems/46.03%3A_Biogeochemical_Cycles/46.3E%3A_The_Phosphorus_CyclePhosphorus, a major component of nucleic acid and phospholipids, also makes up the supportive components of our bones; it is often necessary for growth in aquatic ecosystems.