Carbon is an element It is part of oceans, air, rocks, soil and all living things. Carbon doesn’t...
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Transcript of Carbon is an element It is part of oceans, air, rocks, soil and all living things. Carbon doesn’t...
![Page 1: Carbon is an element It is part of oceans, air, rocks, soil and all living things. Carbon doesn’t stay in one place.](https://reader035.fdocuments.in/reader035/viewer/2022062519/5697c0011a28abf838cc2956/html5/thumbnails/1.jpg)
THE CARBONCYCLE
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• Carbon is an element• It is part of oceans, air, rocks,
soil and all living things. • Carbon doesn’t stay in one place.
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Carbon moves from the atmosphere to plants.
Atmosphere-carbon is attached to oxygen in the form of carbon dioxide (CO2).
CO2 with the help of the sun, using a processes called photosynthesis, is pulled from the air to make plant food. (C6H12O6)
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Photosynthesis6CO2 + 6H2O Light Energy C6H1206 + 12 02
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Carbon moves from plants to animals
• Carbon that is in plants move to animals that eat the plants.
• Animals that eat other animals get the carbon from the plants the other animals have eaten
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Carbon moves from living things to the atmosphere
• Exhaling releases CO2 into the atmosphere.
• Animals and plants get rid of CO2 gas through a process called respiration.
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Carbon moves from plants and animals to the ground
• When plants and animals die, their bodies, wood and leaves decay bringing carbon into the ground.
• Some becomes buried miles underground and will become fossil fuels in millions and millions of years.
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Carbon moves from plants and animals to the ground continued
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Carbon moves from fossil fuels to the atmosphere when fuels are burned.
• When humans burn fossil fuels to power factories, power plants, cars and trucks, most of the carbon quickly enters the atmosphere as CO2
• Yearly five and a half BILLION tons of carbon is release by burning fossil fuels (or the weight of 100 MILLION adult elephants)
• 3.3 billion tons enter the atmosphere and the rest becomes dissolved in seawater
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Carbon moves from the atmosphere to the oceans
• Oceans and other bodies of water, soak up some carbon from the atmosphere.
• Animals that live in the ocean use carbon to build their skeletons and shells
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coccolith
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White Cliffs of Dover, England
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Carbon dioxide is a green house gas
• CO2 traps heat in the atmosphere
• Without CO2 and other greenhouse gases, Earth would be a frozen world
• Humans have burned so much fuel that there is about 30% more CO2 in the air today than there was about 150 years ago.
• More greenhouse gasses such as CO2 in our atmosphere are causing our planet to become warmer.
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Carbon moves through our planet over longer time scales
• Over millions of years weathering of rocks on land may add carbon to surface water which eventually runs off to the ocean.
• Carbon is removed from seawater when the shells and bones of marine animals and plankton collect on the sea floor. Shells and bones are made of limestone, which contains carbon.
• When the shells and bones are stored on the sea floor they are removed from the carbon cycle
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Carbon moves through our planet over longer time scales continued
• Carbon can be released back to the atmosphere if the limestone melts or is metamorphosed in a subduction zone.
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Movement of carbon
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Feedback Systems• Negative Feedback
The case where the output of a system counteracts the input of the system.
Body temp
Sweating
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• Positive FeedbackThe case where the output of a system increases the input of the system
Feedback Systems
Bank account balance
Interest earned
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Carbon Cycle Feedback
• The carbon cycle is naturally a negative feedback loop.
• The burning of fossil fuels and deforestation interferes with this feedback loop.Deforestation increases atmospheric CO2.
Burning of fossil fuels also increase atmospheric CO2.
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