phreatic
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1. A spokesman for Indonesia's National Disaster Mitigation agency, said via a text message that there had been a "phreatic eruption" late on Tuesday with black smoke reaching 700 metres (2,300 ft), followed by falling ash, gravel and sand.
2. "These types of eruptions — called phreatic — are the product of rock that already exists being shattered violently when water heated by the rising magma under Agung quickly turns to steam," according to a blog post on the Discovermagazine.
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