科学家们在木卫二的高清照片上,也找到了非常类似的裂缝。这些棕红色的裂缝看起来地球上的中洋脊,这些高山峡谷也有类似转换断层的结构。也出现了某一段的整体错位。同样,科学家们也找到了类似俯冲带的结构。一块冰盖插入了另外一块冰盖之下。当然,科学家们推测,冰层俯冲带和地球上的岩石俯冲带还是有区别的。冰板块的边缘可能会碎裂,造成一大堆的碎冰。但是,大家要明白一点,太阳系的星球上,咸水远比淡水要多得多。木卫二上的冰层是含盐的。但是因为两块板块的含盐度不同。有些碎冰块轻一点,有些稍微重一点。重一点的会被压在下边,甚至被推到了冰盖的下边,就起到了俯冲带的作用。这些被挤下去的冰块,最终会化成水。当然啦,这种板块活动是不是全球性的呢?这还难说。现在能找到的俯冲带比较短,不像地球上的俯冲带那么广泛。另外,板块活动的动力来源依然还是有疑问的。对了,为什么那些裂纹会变成棕红色呢?现在科学家们分析,这是因为这些地方的盐份比较高,在高能带电粒子的轰击下,这些盐变色了而已……
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