Pyroclastic density currents generate a basal air cushion that reduces friction with the ground, reveal laboratory experiments. This explains their ability to travel rapidly over large distances from their volcanic source.
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References
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Burgisser, A. Travel on thin air. Nat. Geosci. 12, 311–312 (2019). https://doi.org/10.1038/s41561-019-0346-2
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DOI: https://doi.org/10.1038/s41561-019-0346-2
