Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
erupt – v. to send out rocks, ash, lava, etc., in a sudden explosion
evacuation – n. the moving of people from a dangerous place to somewhere safer
alert – n. an alarm or signal of danger
tremor – n. a shaking motion
crater – n. large hole in the top of a volcano
