A dating technique based on the thickness of a chemically altered layer on the surface of tools made of volcanic glass is:

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The dating technique based on the thickness of a chemically altered layer on the surface of tools made of volcanic glass is obsidian hydration. This technique works by measuring the depth of penetration of water vapor into the surface of the obsidian artifact. Over time, the water reacts with the glass to form a rind that gradually thickens. The thickness of this rind is used to determine the age of the artifact.

A Dating Technique Based on the Thickness of a Chemically