Global Carbon Cycle 7. b. Students know the global carbon cycle: the different physical and chemical forms of carbon in the atmosphere, oceans, biomass,

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Presentation transcript:

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.

The Global Carbon Cycle Carbon dioxide in the atmosphere is dissolved and stored in the ocean as carbonate and bicarbonate ions, which organisms take in to make their shells.

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.

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

Carbon Reservoirs Carbon dioxide Atmosphere Biosphere Oceans Fossil Fuels Carbon dioxide Sugar and organic molecules in living organisms Dissolved carbon dioxide and bicarbonate and carbonate ions Coal Oil Gas Deposits

How is carbon cycled through? Biological Means Respiration and photosynthesis Physical Means Plate tectonics Geologic Cycle

Movement of the carbon cycle Some movement of carbon between reservoirs takes place through biological means respiration photosynthesis

Movement of Carbon Cycle Physical means, such as those related to plate tectonics and the geologic cycle.

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. 3

Section 1 Global Temperature The Greenhouse Effect The greenhouse effect occurs when greenhouse gases, such as carbon dioxide, trap heat within Earth's atmosphere. 5