Where plates in the Earth's crust collide,

在地球板块碰撞区域

the rock on the sea floor containing carbon from theplankton shells

死亡浮游生物构成的含有二氧化碳的岩石所处的海底

is carried deep into the Earth.

俯冲陷落到地球深处

This is called subduction.

这就叫俯冲

As it descends, this layer of rock is heated

在沉降过程中，这层岩石被加热

and melts, releasing carbon dioxide.

并且释放出二氧化碳

This gas is returned back into the atmosphere during an eruption.

随着火山爆发，气体重返大气层。

The remarkable cycle is completed.

这就完成了这个非同寻常的循环。

It's uncanny how life and volcanoes,

火山和生命合作

keep just the right amount of carbon dioxide in our atmosphere,

让大气中的二氧化碳数量保持在适合的水平

keeping our planet at a comfortable temperature.

使地球保持在舒适的温度舒

This process that had sustained all life on the planet,

这个过程支撑了行星上所有的生命

comes at an enormous cost.

但为此付出的代价也是巨大的

Subduction volcanoes are the most violent on Earth.

俯冲带火山是地球最暴烈的火山

You can see just how explosive they are

请看记录下来的一次最著名的爆发

by looking at one of the most famous eruptions ever recorded.

您就明白他们的喷发多么震撼