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  • Intro to biogeochemical cycles (article) | Khan Academy
    The ways in which an element—or compound such as water—moves between its various living and nonliving forms and locations in the biosphere is called a biogeochemical cycle Biogeochemical cycles important to living organisms include the water, carbon, nitrogen, phosphorus, and sulfur cycles
  • Biogeochemical cycles review (article) | Khan Academy
    Not every nutrient will go through these cycles in the same path People often think that biogeochemical cycles are linear, and that each atom or molecule goes through the cycle step-by-step
  • Biogeochemical cycles overview (video) | Khan Academy
    Biogeochemical cycles are nature's way of recycling essential elements for life, like water, carbon, nitrogen, and phosphorus These cycles circulate these molecules through ecosystems and the entire biosphere From the water cycle to the carbon cycle, these processes ensure the constant reuse of matter, while energy flows through the ecosystem Created by Sal Khan
  • The carbon cycle (article) | Khan Academy
    Biogeochemical cycles Everything on Earth is made up of chemical elements, such as carbon, nitrogen, and oxygen These elements are transferred through the Earth's natural systems by a series of chemical, physical, geological, and biological processes known as biogeochemical cycles (also called nutrient cycles)
  • Ecology | Biology archive | Science | Khan Academy
    This unit is part of the Biology archive Browse videos and articles by topic For our most up-to-date, mastery-enabled courses, check out High School Biology and AP Biology
  • The carbon cycle (article) | Ecology | Khan Academy
    Learn how carbon moves through Earth's ecosystems and how human activities are altering the carbon cycle
  • The phosphorus cycle (article) | Ecology | Khan Academy
    Natural cycling of phosphorus The phosphorus cycle is slow compared to other biogeochemical cycles such as the water, carbon, and nitrogen cycles 1 In nature, phosphorus is found mostly in the form of phosphate ions— PO 4 3
  • The nitrogen cycle (article) | Ecology | Khan Academy
    Learn about the nitrogen cycle, its processes, and significance in ecosystems on this educational platform
  • Human impacts on biogeochemical cycles - Khan Academy
    Biogeochemical cycles, such as the carbon and nitrogen cycle, are influenced by one another These biogeochemical cycles are also affected by human activities that change how chemical elements (such as carbon and nitrogen) are stored or released
  • The water cycle (article) | Ecology | Khan Academy
    For a more detailed breakdown, see the USGS Water Science School website 1 Image credit: Biogeochemical cycles: Figure 1 by OpenStax College, Concepts of Biology, CC BY 4 0 Many living things depend on this small supply of surface fresh water, and lack of water can have serious effects on ecosystems





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