地幔，这种物质可以在板块边界处下沉，然后向上回流到较远的地方，再与地壳相碰撞——这个过程被称为小规模的对流。
Mantle material can sink at a plate boundary, and then flow back upward farther away, pushing on the crust - a process called small scale convection.
最深的地震通常发生在板块边界的地方的地壳正在俯冲到地球的地幔。
The deepest earthquakes typically occur at plate boundaries where the earth's crust is being subducted into the earth's mantle.
火山活动与热流上涌、地壳拉伸减薄、上地幔及下地壳物质熔融并沿块体边界向浅部上移有关。
The volcanic activities have relations to the heat-flow upwelling, crust thinning, upper mantle and lower crust melting, and upward movement of the melt materials along the block boundaries.
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