Rock Tasting at Biosphere 2

Scientific American
Rock Tasting at Biosphere 2
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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