uniformitarianism
Uniformitarianism The geologic processes that happen today (mountain building, volcanoes, rocks) happened the same way in the past AND change on the Earth is occurring slowly and constantly. How is this like a cake? The Principle of Uniformitarianism is like a layer cake because people basically make cakes the same way every time.
"Uniformitarianism is like convicting a murderer for every murder that has ever happened because he was the most recent suspect to be convicted of murder. It's like using evidence from a completely different case that didn't involve a suspect whatsover to convict this suspect."
Things work in the present the same way they have in the past. Therefore what occurred, geologically, in the past can be inferred from what can be observed in the present.
The assumption of a constant. However pi is not an assumption but something that can be determined using geometry and mathematical proofs.
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