Long, thin lava flows are typically produced by

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Long, thin lava flows are typically produced by low-viscosity lavas, which are able to flow more easily and travel further from the eruption source. Volatile-rich eruptions tend to produce explosive eruptions with ash and pyroclastic material rather than long, thin lava flows. High-viscosity lavas are thick and unable to flow very far, resulting in shorter and wider lava flows. Collapsing eruption columns can produce pyroclastic flows, but not long, thin lava flows.

Long, Thin Lava Flows Are Typically Produced by