Every volcano has its own chemistry. The chemistry of the “pozzolana” ash produced by Italy’s Campi Flegri is especially useful when the pressure builds up.
Not mentioned in that video is the third key ingredient: sea water, which can strengthen the concrete over time.
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by John Bengtson "the great detective of silent film locations" New York Times
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Exploring the Civil War-era landscape in the Fredericksburg & Spotsylvania region.
Our Discovery and Usage of the Chemical Elements
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Silence Is Golden
