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…ch as volcanic and tectonic activity are not included.<ref name="nasacc">{{cite web|last1=Riebeek|first1=Holli|title=The Carbon Cycle|url=http://earthobser …me=14 |issue=2 |doi=10.5751/ES-03180-140232 |doi-access=free}}</ref><ref>{{Cite journal |title = Planetary boundaries: Guiding human development on a chang

…itation]] of the operation of a process or system;<ref name="definition">{{cite book|title=Discrete-Event System Simulation|author1=J. Banks|author2=J. Car …it is being designed but not yet built, or it may simply not exist.<ref>{{cite book |author=Sokolowski, J.A. |author2=Banks, C.M. |title=Principles of Mod