地球的力量 第1集 火山(29)氣體重返大氣層

Where plates in the Earth's crust collide,

在地球板塊碰撞區(qū)域

the rock on the sea floor containing carbon from theplankton shells

死亡浮游生物構(gòu)成的含有二氧化碳的巖石所處的海底

is carried deep into the Earth.

俯沖陷落到地球深處

This is called subduction.

這就叫俯沖

As it descends, this layer of rock is heated

在沉降過程中，這層巖石被加熱

and melts, releasing carbon dioxide.

并且釋放出二氧化碳

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

隨著火山爆發(fā)，氣體重返大氣層。

The remarkable cycle is completed.

這就完成了這個(gè)非同尋常的循環(huán)。

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,

讓大氣中的二氧化碳數(shù)量保持在適合的水平

keeping our planet at a comfortable temperature.

使地球保持在舒適的溫度舒

This process that had sustained all life on the planet,

這個(gè)過程支撐了行星上所有的生命

comes at an enormous cost.

但為此付出的代價(jià)也是巨大的

Subduction volcanoes are the most violent on Earth.

俯沖帶火山是地球最暴烈的火山

You can see just how explosive they are

請看記錄下來的一次最著名的爆發(fā)

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

您就明白他們的噴發(fā)多么震撼