An Interactive Introduction to Organismal and Molecular Biology, 2021

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SYSTEMS THINKING AND THE CARBON CYCLE | 65 The four spheres of Earth include the atmosphere (the air), biosphere (anything living, including organisms living in water), lithosphere (rocks, minerals, sand), and hydrosphere (marine and freshwater). The following activity will end with a carbon cycle that focuses on these four spheres. Exercise The following is a list of processes describing how carbon moves (i.e., the fluxes of the carbon cycle). Refer to the definitions of each of these processes while performing the activity below. An interactive or media element has been excluded from this version of the text. You can view it online here: https://openbooks.lib.msu.edu/isb202/?p=153
66 | SYSTEMS THINKING AND THE CARBON CYCLE Using the definitions of each carbon flux above, develop a carbon cycle model. In the model below, each corner is one of the spheres (e.g., atmosphere), and each arrow represents a flux, which is the movement of carbon from one sphere to another sphere. Notice that one of the arrows (between the atmosphere and hydrosphere) is a double arrow; one of the fluxes represents carbon moving back and forth between the atmosphere and hydrosphere. To complete the model below, drag each carbon flux (on the right side of the activity) to its appropriate arrow. The two red, dotted-line arrows are human activities, and the black solid-line arrows are natural processes. Alternatively, feel free to complete the activity below the carbon cycle model, which addresses the same information, but in sentence form. An interactive or media element has been excluded from this version of the text. You can view it online here: https://openbooks.lib.msu.edu/isb202/?p=153 This activity meets the same objectives as above, but just in a different format. Feel free to do this one instead or do it before creating the visual model above. An interactive or media element has been excluded from this version of the text. You can view it online here: https://openbooks.lib.msu.edu/isb202/?p=153 Potential Carbon Molecule Paths As seen in the above activity, there are many ways in which carbon moves through the earth’s spheres. To combine the ideas of the first carbon diagram shown earlier and the created carbon model, consider what are the more specific reservoirs of carbon in each sphere. For instance, the first model shows trees and cows, which are in the biosphere, and fossil fuels used by factories and cars, in which fossil fuels are part of the lithosphere.
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INTRODUCTION Andrea Bierema This
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UNIT I INTRODUCTION TO SCIENCE
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