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Presentation Details: Slides: 6 Duration: 00:03:53 Filename: C:\Users\jpage\Documents\NCVPS Learning Objects\STEM EarthEnvironmental Carbon Cycle Navigation to PPT W\The Carbon Cycle power point.pptx Presenter Details: THE CARBON CYCLE Published by Articulate® Presenter www.articulate.com Slide 1 Notes: The Carbon Cycle In this mini-lesson, we’re going to learn a little bit about the carbon cycle and how it works. Duration: 00:00:06 Advance mode: Auto THE CARBON CYCLE Slide 2 Key Terms Duration: 00:00:39 Advance mode: Auto KEY TERMS Sink-Also called a “store,” this is a place where carbon ends up and stays for a while. Pump-A physical or Biological factor that moves carbon through the carbon cycle Biotic factor-A living thing in an environment Abiotic factor-Anything non-living in an environment Slide 3 The carbon cycle Duration: 00:00:46 Advance mode: Auto Published by Articulate® Presenter THE CARBON CYCLE Summarizes how carbon is moved from atmosphere, to the earth, water, or biotic factors in the environment and back again. At each step in the cycle, carbon in chemically changed into different compounds. Notes: Before we get started, let’s review some key terms. The first term is “sink” and sink is also called a “store.” A carbon sink is where carbon ends up and stays for a while. The second term is “pump,” and a pump is a physical or biological factor that moves carbon through the carbon cycle. Then we have two terms that are related to one another, the biotic and abiotic factors. A “biotic” factor is a living thing in an environment or anything that comes from a living thing in an environment. An abiotic factor is anything that never lived in an environment. Notes: The picture you see in front of you shows the carbon cycle. The carbon cycle is basically a summary of how carbon gets moved from the atmosphere to the earth, or to water or biotic factors in the environment and back to the atmosphere again. As you look at the picture, you’ll notice that at each step in the cycle, carbon gets changed chemically into different compounds. So in the atmosphere, you’ll see it as carbon dioxide, but when it’s taken out of the air, it gets transformed into carbohydrates like glucose and other sugars to form a different www.articulate.com chemical compound. Those chemical compounds, as they get passed through the food chain to other organisms, get transformed into other compounds. Slide 4 Photosynthesis and Respiration as Carbon Pumps Duration: 00:00:55 Advance mode: Auto Published by Articulate® Presenter PHOTOSYNTHESIS AND RESPIRATION AS CARBON PUMPS Photosynthesis takes CO2 from the atmosphere and converts it to glucose and O2 Plants and animals take in the glucose to get energy and O2, then release CO2 back to the environment. Notes: Remember, as we look at the carbon cycle, we’re looking at carbon pumps and carbon sinks. So, let’s isolate two very important carbon pumps in the carbon cycle, photosynthesis and respiration. Photosynthesis is also called carbon fixation. In other words, it takes unuseable carbon dioxide from the atmosphere, and transforms it to a useable form of carbon for plants and animals called glucose. You’ll notice in the picture that when photosynthesis happens, oxygen gets released by the plants. The animals take in that oxygen and the glucose that the plant has released and convert it chemically to release carbon back to the atmosphere as carbon dioxide, which can be reabsorbed bythe plant. So plants and animals take in the glucose, get the energy, but then release carbon dioxide back to the atmosphere as a result. www.articulate.com Slide 5 Other Carbon Pumps Duration: 00:00:24 Advance mode: Auto OTHER CARBON PUMPS Combustion-burning of wood or fossil fuels for energy, powering vehicles or industry Volcanic activity Death and Decay Slide 6 Carbon Sinks Duration: 00:01:03 Advance mode: Auto CARBON SINKS Published by Articulate® Presenter Sometimes, carbon gets “stuck” someplace. That place is called a sink or “store.” Carbon sinks include the atmosphere, fossil fuels, the ocean (and it’s sediments), soil, and in molecules of living things. The length of time carbon is stored depends on the sink. Notes: Photosynthesis and respiration, of course, are not the only carbon pumps in the carbon cycle. Combustion, which is burning of wood or fossil fuels for energy, that powers our houses, vehicles, and factories, pumps carbon into the atmosphere. Some natural processes, like volcanic activity and death and decay also pump carbon into the atmosphere. Notes: Don’t forget, in addition to the carbon pumps that we’vetalked about, you also have carbon sinks. Remember that these are places where carbon is stored for some period of time, so the carbon gets “stuck” someplace. That’s why we also call it a carbon store. Carbon sinks include the atomosphere, which makes sense because there’s a lot of carbon dioxide in the atmosphere, fossil fuels which store the carbon in the form of hydrocarbons and of course the ocean and its sediments,which store carbon for periods of time. Soil, and of course, you are carbon sinks as well. Organisms store carbon inside of them. The length of time that carbon is stored depends on the sink. An organism, like you, which takes in carbon-containing food regularly and respire and release carbon dioxide to the atmosphere regularly, is a short-term sink. Fossil fuels are long-term sinks which can store carbon for tens of thousands of years. www.articulate.com