demonstrate understanding of carbon cycling
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DESCRIPTIONDemonstrate Understanding of Carbon Cycling. Science A.S. 1.14. Carbon. Widely distributed in nature Found in stars, planets, comets Diamond, graphite and compounds (many vital for life) CO 2 (atmosphere and dissolved in water) Carbonates (rocks like limestone) - PowerPoint PPT Presentation
Demonstrate Understanding of Carbon CyclingScience A.S. 1.14
CarbonWidely distributed in natureFound in stars, planets, cometsDiamond, graphite and compounds (many vital for life)CO2 (atmosphere and dissolved in water)Carbonates (rocks like limestone)Hydrocarbons (methane, coal, oil and plastics)
Addition of CarbonNaturalRespiration (animal/ plant)DecayVolcanic activityAnthropogenic (man made)Combustion
RespirationConversion of fuel into energy by burning with oxygenPlants and animals do thisThey use the energy for life processesC6H12O6 + 6O2 6CO2 + 6H2O + energy
DecayAnimals and plants are made of carbon.When they die decomposing microbes break them down to produce energy.If oxygen is present the carbon is recycled as carbon dioxide.If no oxygen is present methane is produced.Decay video
The Earth cycles heat and carbon dioxidehttp://www.newscientist.com/data/images/archive/2675/26751901.jpg
http://www.topnews.in/usa/why-tectonic-plates-move-way-they-do-24873Volcanic activityCarbon can be locked away for a long time as rock.It is returned to the atmosphere via volcanic eruptions.
Volcanic eruptions release CO2http://www.teara.govt.nz/en/volcanoes/2/2
Volcanic ActivityVolcanic eruptions release water vapor, carbon dioxide and sulfur dioxide into the atmosphere. 1986 a large leakage of naturally sequestered carbon dioxide rose from Lake Nyos in Cameroon and asphyxiated 1,700 people. Long term process for CO2 addition.
CombustionFossil fuel + 6O2 6CO2 + 6H2O + energyComplete combustion of hydrocarbons produces CO2
West coast logging
Removal of CarbonMay be long or short term carbon sinksNaturalPhotosynthesis (s)Dissolving in oceans (s)Formation of rock (l)AnthropogenicScrubbers (l/s)Nanotube filters (s)
Carbon dioxide and the oceanshttp://www.niwa.co.nz/__data/assets/image/0006/49443/gas2_large.jpg
Areas of Photosynthesis
Photosynthesis6CO2 + 6H2O sunlight C6H12O6 + 6O2
Green plants use the Suns energy to convert carbon dioxide and water into food. Deforestation impacts on photosynthesis.Phytoplankton undertake most photosynthesis.
Plankton capture carbon dioxide and form limestonehttp://www.pmel.noaa.gov/co2/OA/OA1.jpg Green machine
Dissolving in OceansCarbon dioxide dissolves in water to produce acid.The decrease in pH will be bad for coral and shellfish.Absorption of CO2 by the oceans helps lessen the climatic effects of mans emissions.
Forming RockCO2 reacts with metal oxides to produce stable carbonates (limestone)This process takes ages!The carbon can be locked away for a long time.Carbon can also be stored as coal.
Pancake rocks Caveshttp://www.easytickets.com.sg/Honeymoon%20Packages/New/Pages/NZ/NZ%20Romance%20in%20the%20South.html
Limestone formationsLimestone is a sedimentary rock made from shells.Water dissolves Limestone producing sinkholes and caves.calcium carbonate formations of stalactites, stalagmites are common.Harwoods Hole
Carbon Capture (sequestration)Stopping CO2 from entering the atmosphere (costly)FiltersCarbon nanotubes are 1/50,000th of the width of a human hair.They are made into filters to capture CO2 from industrial chimneys.GeologicalCO2 is injected into older oil fields to extract more oil. It could be trapped for millions of years. Cement production also captures CO2
The global carbon cycle involves the earth's atmosphere, fossil fuels, the oceans, and the vegetation and soils of the earth's terrestrial ecosystems [Figure 2].
*Diamond/ graphite modelsCreate list of things made with carbon/ what do all these things have in commonClick view chemistry carbon cycleBreathing earth*Build carbon cycle diagram*Catalytic converters co = co2 therefore increase co2 emissionsExpt Volcano build**Volcanic carbon dioxide release and carbonate rock formation is roughly equal so the two processes, which are the chemical reverse of each other, sum to roughly zero, and do not affect the level of atmospheric carbon dioxide on time scales of less than about 100,000 years.*We know that CO2 in the atmosphere is rising, thanks to the Keeling Curve, based on atmospheric sampling on Hawaiis Mauna Loa, and similar monitoring stations (including one near me, atop Niwot Ridge here in Colorado). We also know that the curve charting increasing CO2 concentrations (the solid line below) matches nearly perfectly the cumulative production of CO2from fossil fuel burning and cement production (the dashed line): Breathing earth website**Scrubbers usually 2LiOH(s) + co2 = LiCO3(s) + H2ONanotube graphite thin layer cylinders build filters trap co2
*Land green = photosynthesisSea red = most photosynthesis, green also highCo2 returned as respiration takes place = short termCo2 used to make shells is long term as when the creature dies the shell remains, sinks converted to carbonate, returns as uplifted marble (metamorphic)WATCH Nasa video oceans green machine*How much co2 can the oceans hold?Cold southern ocean holds more than warm tropicsDEMO 2 cans of fizz one cooled and one warmed, open them and watch warm one fizz up**183m dropEXPT Marble and acid**http://news.cnet.com/8301-13639_3-10401075-42.html (nanotube)http://www.technologyreview.com/energy/22650/ (locking co2 away)