读某区域等高线地形图，回答下列问题。图中沙洲岛形成于

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19484' and id < 1687952 and id<>'1687952' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19484' and id > 1687952 and id<>'1687952' order by id asc limit 5