Final answer:
Stratigraphy is the study of layers of rock in the Earth's crust, helping geologists understand the Earth's geological history.
Step-by-step explanation:
Stratigraphy is the study of layers of rock in the Earth's crust. It involves analyzing the order, composition, and age of different rock layers to understand the geological history of an area. Stratigraphy helps geologists interpret past geological events, such as volcanic eruptions, deposition of sediments, and the formation of fossils.
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