Rock Tasting at Bi

Rock Tasting at Biosphere 2
Scientific American
Dragos Zaharescu grows ponderosa pine seedlings on a ground-rock medium to study the impact bioweathering has on the generation of soil. Zaharescu conducts his experiments at the Biosphere 2, 35 miles north of Tucson, Ariz. Photo taken on Oct. 5, 2012.
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