Asked by Diamond
The volcano Izalco in El Salvador is a small, steep-sided volcano. What conclusions can be drawn about the characteristics of the lava that formed this volcano?
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A small, steep-sided volcano indicates the lava that built it was relatively viscous — thick and not very fluid. That implies:
- high silica content (andesitic to rhyolitic composition)
- lower eruption temperature and poorer flowability, so lava didn’t travel far and piled up near the vent
- gases tended to be trapped, promoting more explosive eruptions and production of pyroclastic material that also helps build steep slopes.
- high silica content (andesitic to rhyolitic composition)
- lower eruption temperature and poorer flowability, so lava didn’t travel far and piled up near the vent
- gases tended to be trapped, promoting more explosive eruptions and production of pyroclastic material that also helps build steep slopes.
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