C carbon cycle last
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The carbon cycle describes how carbon is exchanged between the biosphere, geosphere, hydrosphere and atmosphere of the Earth. Carbon exists in different forms that cycle between organisms, the Earth's atmosphere, oceans, soil and rocks through biological and geological processes over timescales ranging from years to millions of years. Key aspects of the carbon cycle include photosynthesis, respiration, decomposition, and the burning of fossil fuels.
C carbon cycle last
- 2. What Is Carbon? An element The basis of life of earth Found in rocks, oceans, atmosphere
- 3. Carbon Cycle The same carbon atoms are used repeatedly on earth. They cycle between the earth and the atmosphere.
- 4. 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).
- 5. Animals Eat Plants When organisms eat plants, they take in the carbon and some of it becomes part of their own bodies.
- 6. 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.).
- 7. Carbon Slowly Returns to Atmosphere Carbon in rocks and underground deposits is released very slowly into the atmosphere. This process takes many years.
- 8. Cycle – Repeats Over and Over and Over and Over …
- 10. The Carbon Cycle
- 11. 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.
- 12. Algae in the oceans are most responsible for CO 2 uptake.
- 13. 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
- 14. What We Need to Do Burn less, especially fossil fuels Promote plant life, especially trees
- 15. 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.