关于火山喷发的英语作文

详细内容

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avolcanoisanopening,orrupture,inapla'ssurfaceorcrust,whichallowshot,moltenrock,ash,andgasestoescapefrombelowthesurface.volcanicactivityinvolvingtheextrusionofrocktendstoformmountainsorfeatureslikemountainsoveraperiodoftime.