Phreatic eruption

A phreatic eruption, also called a phreatic explosion, ultravulcanian eruption or steam-blast eruption, occurs when magma heats ground or surface water. The extreme temperature of the magma (anywhere from 500 to 1,170 °C (932 to 2,138 °F)) causes near-instantaneous evaporation to steam, resulting in an explosion of steam, water, ash, rock, and volcanic bombs. At Mount St. Helens, hundreds of steam explosions preceded a 1980 plinian eruption of the volcano. A less intense geothermal event may result in a mud volcano.

单词	Phreatic eruption
释义	Phreatic eruption 原声例句 CNN 10 学生英语 2018年5/6月合集 The lava lake and the volcano's crater has been dropping for weeks now and officials are concerned that that could lead to a phreatic eruption, when steam from ground water builds up and causes an explosion. 熔岩湖和火山的火山口已经下降了几个星期了，政府官员们担心，当来自地下的蒸汽积聚起来并引起爆炸时，可能导致潜水喷发。英语百科 Phreatic eruption A phreatic eruption, also called a phreatic explosion, ultravulcanian eruption or steam-blast eruption, occurs when magma heats ground or surface water. The extreme temperature of the magma (anywhere from 500 to 1,170 °C (932 to 2,138 °F)) causes near-instantaneous evaporation to steam, resulting in an explosion of steam, water, ash, rock, and volcanic bombs. At Mount St. Helens, hundreds of steam explosions preceded a 1980 plinian eruption of the volcano. A less intense geothermal event may result in a mud volcano.
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