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。
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.
测高空间重力异常也可刻画陆架构造及盆地分布，由其推算出的海底地形含有大量的海底构造信息。
The altimetry free air gravity anomaly can describe structure and basin on continental shelves, and its derived submarine topography contains lots of submarine tectonic information.
当各大洋重新出现时，新地壳便从各个火山喷涌而出；当构造板块移回到海底深处(这些火山的最终喷发就是源于海底深处)时，旧地壳便被摧毁。
As oceans reopen new crust is pulled forth from volcanoes; old crust is destroyed as tectonic plates return to the depths from which those volcanoes ultimately draw their fire.
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