Hazard map, produced in 2011, showing where ballistic projectiles, which are large rocks launched through the air like artillery, are likely to land in a worst-case-scenario eruption. Credit: PHIVOLCS

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Hazard map, produced in 2011, showing where ballistic projectiles, which are large rocks launched through the air like artillery, are likely to land in a worst-case-scenario eruption. Credit: PHIVOLCS

Hazard map, produced in 2011, showing where ballistic projectiles, which are large rocks launched through the air like artillery, are likely to land in a worst-case-scenario eruption. Credit: PHIVOLCS

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