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Activity 4.2: Carbon Pools and Constant Flux Simulation (30 min)

Target Student Performance

Students describe the relationship between pools and fluxes in an online computer model: changes in pool sizes depend on balance among fluxes.

Resources You Provide

  • Computer (1 per student or pair of students)

Resources Provided


Print one copy of 4.2 Computer Model for Constant Flux Worksheet for each student. Prepare computers for each student or pair of students to run the Constant Flux Simulation.


1. Use the instructional model to show students where they are in the course of the unit.


During the discussion after the simulation, be sure that students recognize that the patterns are the same as in Activity 4.1 even though there is a larger number of atoms in the system. Use 4.2 Grading the Computer Model for Constant Flux Worksheet to grade students' work.

  • Have students work in pairs, with each pair using one computer and one worksheet.
Extending the Learning