Geosonnet 25

The Earth once had a frozen shell of ice
encasing oceans, land, from pole to pole.
The mystery: what process could suffice
To kiss Snow White, rouse cryogenic soul.
One theory says volcanic CO₂
Would slowly warm the Earth until the thaw
As ice breaks up, the air and water brew:
Carbonic acid forms: paleo-spa.
The isotopes of boron measure bases.
Post-glacial carbonates record the change
As acid forms, the calcium replaces
Hydronium, a weathering exchange.
   Across the world, the acid came and went;
   A single ocean-atmosphere event.

Geology 42 1103

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