stratum (C2)
noun
Pronunciation: /ˈstrɑːtəm/
Definition
A layer or a series of layers of rock, soil, or other material.
Examples
The archaeologist carefully examined the different strata of soil at the dig site.
Each stratum in the sedimentary rock tells a story about the environment at the time it was formed.
The upper stratum of the soil is rich in organic matter.
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