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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 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
  • 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
  • Learn: 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
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  • Learn: Human impacts on biogeochemical cycles - Khan Academy
    Learn how human activities affect biogeochemical cycles The amount of carbon dioxide in the atmosphere has increased rapidly over the past century, and this increase is largely the result of human activities Carbon dioxide is a greenhouse gas, meaning that it traps heat and keeps it from radiating into space With more carbon dioxide in the atmosphere, global temperatures have risen
  • Biogeochemical cycles are influenced by human activities
    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
  • Food chains food webs (article) | Ecology | Khan Academy
    How food chains and food webs represent the flow of energy and matter Trophic levels and efficiency of energy transfer





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