Combining many layers into one would mean less weight and more freedom to move.
将多层合一意味着重量减轻，活动更加自如。
These plates move because they lie upon a soft, hot under layers.
这些板块处于柔软、炽热的地层上，所以会移动。
A plate, being solid rock in layers, tends to move as one.
如果一个板块是由坚固的岩石组成岩层的，那么就倾向于整体运动。
A plate, being solid rock in layers, tends to move as one.
如果一个板块是由坚固的岩石组成岩层的，那么就倾向于整体运动。
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