A guiding principle of Earth science is the principle of uniformitarianism-as opposed to catastrophism.

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The guiding principle of Earth science is the principle of uniformitarianism, which states that geological processes occurring now are the same as those that have occurred in the past. This is in contrast to the earlier popular belief in catastrophism, which posited that Earth's surface features were formed by catastrophic events such as floods, earthquakes, and volcanic eruptions.

A Guiding Principle of Earth Science Is the Principle of Uniformitarianism-As