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C carbon cycle last

C carbon cycle last






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    C carbon cycle last C carbon cycle last Presentation Transcript

    • The Carbon Cycle
    • What Is Carbon?
      • An element
      • The basis of life of earth
      • Found in rocks, oceans, atmosphere
    • Carbon Cycle
      • The same carbon atoms are used repeatedly on earth. They cycle between the earth and the atmosphere.
    • Plants Use Carbon Dioxide
      • Plants pull carbon dioxide from the atmosphere and use it to make food — photosynthesis.
      • The carbon becomes part of the plant (stored food).
    • Animals Eat Plants
      • When organisms eat plants, they take in the carbon and some of it becomes part of their own bodies.
    • Plants and Animal Die
      • When plants and animals die, most of their bodies are decomposed and carbon atoms are returned to the atmosphere.
      • Some are not decomposed fully and end up in deposits underground (oil, coal, etc.).
    • Carbon Slowly Returns to Atmosphere
      • Carbon in rocks and underground deposits is released very slowly into the atmosphere.
      • This process takes many years.
    • Cycle – Repeats Over and Over and Over and Over …
    • The Carbon Cycle
    • Carbon in Oceans
      • Additional carbon is stored in the ocean.
      • Many animals pull carbon from water to use in shells, etc.
      • Animals die and carbon substances are deposited at the bottom of the ocean.
      • Oceans contain earth’s largest store of carbon.
    • Algae in the oceans are most responsible for CO 2 uptake.
    • Human Impact
      • Fossil fuels release carbon stores very slowly
      • Burning anything releases more carbon into atmosphere — especially fossil fuels
      • Increased carbon dioxide in atmosphere increases global warming
      • Fewer plants mean less CO 2 removed from atmosphere
    • What We Need to Do
      • Burn less, especially fossil fuels
      • Promote plant life, especially trees
    • Natural Sources of Carbon Sources of Carbon from Human Activity
      • Death of plants and animals
      • Animal waste
      • Atmospheric CO2
      • Weathering
      • Methane gas from cows (and other ruminants)
      • Aerobic respiration from terrestrial and aquatic life
      • Burning wood or forests
      • Cars, trucks, planes
      • Burning fossil fuels such as coal, oil and natural gas to produce heat and energy.