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Transcript of Lesson 24
Unlike the one-way flow of energy, matter is recycled within and between ecosystems.
Geological processes include volcanic eruptions, the formation and breakdown of rock, and major movements of matter within and below the surface of the earth.
Photo credits: 'horizon' by pierreyves @ flickr
Elements pass from one organism to another and among parts of the biosphere through closed loops called biogeochemical cycles
As matter moves through these cycles, it is never created or destroyed—just changed.
Chemical and physical processes include the formation of clouds and precipitation, the flow of running water, and the action of lightning.
burning of fossil fuels,
clearing of land for building
burning of forests
manufacture and use of fertilizers
The Water Cycle
Water continuously moves between the oceans, the atmosphere, and land—sometimes outside living organisms and sometimes inside them.
Carbon is a major component of all organic compounds, including carbohydrates, lipids, proteins, and nucleic acids.
All organisms require nitrogen to make amino acids, which are used to build proteins and nucleic acids, which combine to form DNA and RNA.
Phosphorus forms a part of vital molecules such as DNA and RNA.
Although phosphorus is of great biological importance, it is not abundant in the biosphere.