他们把他们的理论叫做“海底扩张”。这个理论解释了，随着海底扩张，板块在不同的方向上被推拉。

They called their theory sea floor spreading. The theory explains that as the sea floor spreads, the tectonic plates are pushed and pulled in different directions.

这样,大洋中脊就成为板块分离边界,海底扩张就发生在这里.

The rifts therefore represent divergent plate boundaries where seafloor spreading is taking place.

此界面可能是西南海盆北西—南东向海底扩张期间地幔上隆所引起的。

Which might be caused by mantle uplift during NW-SE-trending sea floor spreading of the Southwest sea basin.

系统的深海深度测量揭示了与海底扩张有关的狭谷带、断裂带和海沟的结构。

It is barely ten since systematic deep ocean bathymetry revealed the structure of rifts , fractures and trenches associated with sea floor spreading.