The principle that the same physical processes currently active in the environment were operating throughout earth's history is known as

The correct answer is Uniformitarianism.

It is a theory which states that modifications in the crust of the Earth during the geological history have resulted from the action of uniform and spontaneouus procedures.

Uniformitarianism, also called as the Doctrine of Uniformity demonstrates the invariance in the philosophies supporting science, like the constancy of causation, or causality, throughout time, but it has also been used to illustrate invariance of physical laws through space and time.