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Links for Articles:

  • Biogeochemical cycles are pathways for the transport and transformation of matter within four categorical areas that make up planet Earth (biosphere, hydrosphere, lithosphere, and the atmosphere). By The Encyclopedia of Earth (EoE), an electronic reference about the Earth, its natural environments, and their interaction with society.

    http://editors.eol.org/eoearth/wiki/Biogeochemical_cycles
  • The carbon cycle can seem like a complex process because there are many interacting parts. By The Science Learning Hub, a national project designed to support the effective teaching of science in New Zealand schools.

    http://sciencelearn.org.nz/Contexts/Future-Fuels/Science-Ideas-and-Concepts/Carbon-cycle
  • All life is based on the element carbon. Carbon is the major chemical constituent of most organic matter, from fossil fuels to the complex molecules (DNA and RNA) that control genetic reproduction in organisms. By The Encyclopedia of Earth (EoE), an electronic reference about the Earth, its natural environments, and their interaction with society.

    http://editors.eol.org/eoearth/wiki/Carbon_cycle
  • The earth is a constant recipient of an enormous flux of solar radiation as well as considerable infall of the cosmic debris that also arrives periodically in huge, catastrophe-inducing encounters with other space bodies, particularly with massive comets and asteroids. Nothing else comes in, and the planet's relatively powerful gravity prevents anything substantial from leaving. Consequently, life on the earth is predicated on incessant cycling of water and materials that are needed to assemble living bodies as well as to provide suitable environmental conditions for their evolution. By The Encyclopedia of Earth (EoE), an electronic reference about the Earth, its natural environments, and their interaction with society.

    http://editors.eol.org/eoearth/wiki/Global_material_cycles
  • The nitrogen cycle represents one of the most important nutrient cycles found in ecosystems. Nitrogen is a required nutrient for all living organisms to produce a number of complex organic molecules like amino acids, the building blocks of proteins, and nucleic acids, including DNA and RNA. By The Encyclopedia of Earth (EoE), an electronic reference about the Earth, its natural environments, and their interaction with society.

    http://editors.eol.org/eoearth/wiki/Nitrogen_cycle
  • The phosphorus cycle is the biogeochemical cycle which characterizes the transport and chemical transformation of phosphorus through the geosphere, hydrosphere and biosphere. By The Encyclopedia of Earth (EoE), an electronic reference about the Earth, its natural environments, and their interaction with society.

    http://editors.eol.org/eoearth/wiki/Phosphorus_cycle
  • Nitrogen is the most abundant element in our planet’s atmosphere. Approximately 78% of the atmosphere is made up of nitrogen gas (N2). By The Science Learning Hub, a national project designed to support the effective teaching of science in New Zealand schools.

    http://sciencelearn.org.nz/Contexts/Soil-Farming-and-Science/Science-Ideas-and-Concepts/The-nitrogen-cycle
  • Phosphorus is a chemical element found on Earth in numerous compound forms, such as the phosphate ion, located in water, soil and sediments. By The Science Learning Hub, a national project designed to support the effective teaching of science in New Zealand schools.

    http://sciencelearn.org.nz/Contexts/Soil-Farming-and-Science/Science-Ideas-and-Concepts/The-phosphorus-cycle