Chemical Weathering | Definition, Types & Examples

A comparison stone comes from a known grave marker dated to 1806. By analyzing weathering patterns on that tombstone and comparing them to the Kensington Runestone, researchers were able to establish a minimum age for the inscription. On the Kensington Runestone, surface biotite minerals have completely weathered away...indicating exposure far older than 200 years from the time it was uncovered in 1898. When considering who could have carved it in the late 1600s, no plausible candidates emerge w

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