Tension builds up between the pieces of the Earth's crust until the energy is released in the form of an earthquake.

壳构造板之间张力不断增加，直到能量以震形式释放出来。

Remember tectonic plates underneath the earth's crust.

壳下面构造板。

And that's because there's a difference between what's happening on the surface -- which is obvious total growth -- and the tectonic forces beneath.

这是因为表上发生事，这里指是人口增长，和深层壳构造力变化是不同。

Earth's crust is made up of giant sections called tectonic plates that fit together like a jigsaw puzzle.

壳由称为构造板巨大部分组成，这些部分像拼图游戏一样拼在一起。