Stratify (verb)

1. To divide a society or group into different levels or classes, typically based on wealth, education, or status.
2. To form or arrange in layers.
3. To form a layer or layers in (soil, rock, or other materials).

Origin:

Early 19th century: back-formation from stratification.

Examples:

1. The society was stratified into different classes based on wealth and education.
2. The rock was stratified due to the movement of the tectonic plates.
3. The soil was stratified due to centuries of erosion.
4. The society was stratified based on race and ethnicity.
5. The sedimentary rock was stratified due to the depositions of different materials.