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The Navajo interpretation of nature attributes geological change and equilibrium, and the sustainability of life in the surface environment, to dynamic processes of renewal driven by interactions between Nohosdzáán (Earth environment) and Yádilhil (Sky environment). An introductory physical-geology course for Navajo students at Navajo Community College incorporates this Navajo model within an Earth systems curriculum, wherein geological materials, landforms, processes of change, and Earth history are interpreted as the result of interacting endogenic (tectonic, magmatic) and exogenic (atmospheric, hydrospheric) processes. Second-order parallels between Navajo and “Western” (Euro-American) models of dynamic equilibrium can be employed to teach rock-cycle processes and other geochemical cycles. Use of Navajo and Euro-American sets of geologic concepts in concert is intended to enhance Navajo …