中国国家地理:罕见的九大自然现象(图)(8)
2009-05-04 09:23:00
中国国家地理网
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冰圈
当水中的漩涡以一定直径尺寸大小做圆周旋转运动,使得水中的冰块和漂浮杂质在漩涡中均匀地分布,便形成我们现在看到的这种神秘的完美圆圈冰层。目前发现的最大冰圈直径超过500英尺,此外人们在不同地点和时间发现不同直径大小的冰圈。
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