冰岛地热资源丰富，其形成原因与下列哪一现象无关？

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19627' and id < 1696235 and id<>'1696235' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19627' and id > 1696235 and id<>'1696235' order by id asc limit 5