Why can Earth’s geologic behavior change even if physical laws remain constant?

While the physical laws governing Earth have remained constant throughout its history, the planet’s geologic behavior has changed significantly over time due to the irreversible loss of internal energy and evolving thermal conditions.1

The principle of uniformitarianism establishes that the fundamental physical and chemical laws governing geologic processes are permanent. However, as Earth has cooled over its 4.5-billion-year history, the intensity and nature of these processes have shifted. Specifically, the decay of radioactive isotopes provides an internal heat source that has diminished over time, leading to changes in the extent of igneous activity and the movement of the crust.1

Consequently, while plate tectonics is the dominant framework for understanding Earth's surface today, it is possible that different processes of deformation occurred during the Precambrian when the planet's interior was much hotter. Thus, Earth's geologic behavior is not static; it is a dynamic system that responds to changing internal temperatures and energy states while operating within the bounds of unchanging physical laws.123