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Global Carbon Cycle
7. b. Students know the global carbon
cycle: the different physical and
chemical forms of carbon in the atmosphere,
oceans, biomass, fossil fuels, and the
movement of carbon among these reservoirs.
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When these organisms die, their shells rain down to the ocean floor, where they may be dissolved if the water is not saturated in carbonate. Otherwise, the shells are deposited on the ocean floor and become incorporated into the sediment, eventually turning into a bed of carbonate rock, such as limestone.
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Carbon Reservoirs Carbon is held temporarily in a number of
reservoirs, such as in biomass (carbon in living things) the atmosphere (as carbon dioxide) oceans fossil fuels
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Carbon ReservoirsAtmosphere Biosphere Oceans Fossil Fuels
Carbon dioxide
Sugar and organic molecules in living organisms
Dissolved carbon dioxide and bicarbonate and carbonate ions
CoalOilGas Deposits
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How is carbon cycled through? Biological Means
Respiration and photosynthesis
Physical Means Plate tectonics Geologic Cycle
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Some movement of carbon between reservoirs takes place through biological means
respiration photosynthesis
Movement of the carbon cycle
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Movement of Carbon Cycle Physical means, such as those
related to plate tectonics and the geologic cycle.
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The Atmosphere and Ecosystems
•Acid Rain Acid rain, which is caused by airborne pollutants that lower the pH of rain, has damaged many forests and lakes, especially in the Northeast.
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Section 1
Global Temperature
•The Greenhouse Effect The greenhouse effect occurs when greenhouse gases, such as carbon dioxide, trap heat within Earth's atmosphere.
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