由于火山喷发而形成于地表的岩石有  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19490' and id < 1688783 and id<>'1688783' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19490' and id > 1688783 and id<>'1688783' order by id asc limit 5