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Uniformitarianism is a geological principle that states that the same natural laws and processes that operate in the universe now have always operated in the universe in the past and apply to the present. This idea, often summarized as "the present is the key to the past," suggests that Earth's geological features were formed by slow, gradual processes that can be observed today, such as erosion, sedimentation, and volcanic activity, acting over vast periods of time.

The concept was most famously articulated by geologists James Hutton in the late 18th century and Charles Lyell in the 19th century. Hutton observed that geological formations like sedimentary rocks and unconformities could only be explained by the slow accumulation of sediments and the gradual uplift and erosion of landmasses over immense timescales. Lyell further developed these ideas, arguing against catastrophism, the prevailing view at the time, which attributed geological changes to sudden, large-scale events like Noah's Flood.

Uniformitarianism has been a cornerstone of modern geology, providing a framework for understanding Earth's history and evolution. It emphasizes the importance of observation and inference, encouraging geologists to look for present-day analogs to explain past geological phenomena. While the fundamental principle remains influential, modern geology acknowledges that certain events, such as asteroid impacts and supervolcano eruptions, can cause rapid and significant geological changes, thus representing a more nuanced understanding of Earth's dynamic history.