The natural hazards that can occur from a volcanic eruption, in addition to lava setting fire to combustible materials, include:
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Landslide and mudslides - Volcanic eruptions can destabilize slopes and cause landslides or mudflows (lahars) due to the mixing of volcanic ash with water.
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Flooding - While not a direct result of the eruption itself, melting snow and ice on a volcano due to heat from an eruption can lead to flooding.
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Earthquakes - Volcanic activity can induce seismic activity, leading to earthquakes in the surrounding area.
Lightning storms can occur during eruptions due to the electrical activity generated by volcanic ash, but they are not as commonly associated with volcanic eruptions as the other hazards.
So, the answers that apply are:
- Landslide and mudslides
- Flooding
- Earthquakes