一些山脉是由于这些板块相互碰撞，迫使板块边缘的岩石向上移动而形成的。
Some mountains were formed as a result of these plates crashing into each other and forcing up the rock at the plate margins.
大卫小心翼翼地向前移动，视线越过边缘看过去。
它们将缓慢向上移动到距离地球30公里的太空边缘。
They will move slowly upwards right to the side of space, 30 km away from the Earth.
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