If an ocean floor tectonic plate meets the edge of a continent and they push against each other, the heavier one sinks down and goes under the other one.
如果一个海底构造板块与大陆边缘接触并相互挤压，较重的板块下沉到另一个的下面。
The explanation may be in Earth's mantle, the layer of rock underlying the tectonic plates and extending down over 1,800 miles to the outer edge of Earth's iron core.
解释可能是在地球的地幔中，这是在构造板块下面的岩石层，向下延伸超过1800英里到地球铁芯的外边缘。
This region marks where heat rising from the leading edge of the plume is pushing rock up, as tectonic forces cause the plume to drift eastward.
这个区域标志来自火山柱主要边缘的热度正在把岩石往上拱，如构造作用力导致火山柱向东方漂移。
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