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core sample
This term is primarily used in technical, scientific, and industrial contexts such as geology, glaciology, and civil engineering. It describes a physical specimen that preserves the stratigraphic sequence of a site, allowing researchers to observe changes in composition or climate over time.
In professional discourse, the term is often paired with verbs like extract, drill, or analyze. It is distinct from a surface sample, as it specifically implies depth and a cylindrical geometry maintained by a hollow drill bit.