Stratigraphy is the study of rock layers and the way they are arranged.
Stratigraphy is important for understanding the history of the Earth and finding things like oil and water.
Examples:
In stratigraphy, scientists look at the different layers of rock.
Stratigraphy helps us learn about the history of the Earth.
The study of stratigraphy is very interesting.
I learned about stratigraphy in school today.
Stratigraphy can help us find important things like oil.
The scientist used stratigraphy to find water under the ground.