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Environmental Science

Volcanic Ash and the Making of Soil Chronosequences

Quick fact

The 1980 eruption of Mount St. Helens deposited ash that, within just a few decades, began forming recognizable soil layers—showing how quickly weathering can act.

Why this is interesting

Imagine a forest whose soil is made of countless ancient volcanic eruptions—each one a layer in a time cake. Yet, how can we tell how old each slice is?