Pyroclastic flow running down the flank of Mayon in the Philippines during 1984 eruption. Source: https://sandatlas.org/ignimbrite/
Pyroclastic_flows_Mayon_Volcano sandat
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A Blog About Stone Gathering, Tumbling and Polishing, and Rocks and Landscapes, from New Zealand – With Musical Interludes (john.tumblestone@gmail.com)