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Updated: August 3, 2026
The upper Piton is unfitted for retaining water, which must percolate through its cinders, pumices, and loose matter into many a reservoir formed by blowing-holes. Snow must also be drifted in and retain, the cold. Moisture would be kept in the cavern by the low conducting power of its walls; so Lyell found, on Etna, a bed of solid ice under a lava-current.
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