Explain how the principle of uniformitarianism would help geologists determine the source of a layer of particular igneous rock ?

Uniformitarianism gave us a tool to interpret the geologic past. In fact, geologists sometimes summarize the concept in the phrase: The present is the key to the past. The concept is applied to all types of geologic processes. ... The other big idea inherent in uniformitarianism is that Earth is a very old place.

Explanation:

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