地球的力量 第1集 火山(28)俯沖火山

Every year, they proliferate into huge brumes

每年，他們繁衍增生形成巨大的霧靄

that color the ocean green.

海洋為之變綠

The ocean absorb carbon dioxide from theatmosphere

海洋從大氣層中吸收二氧化碳

and the plankton use this carbon for both photosynthesis and to make their shells.

浮游生物的生長(zhǎng)消耗二氧化碳

When the plankton died,

浮游生物死亡后

they fall to the sea floor. And here, over thousands of years,

掉落海底。經(jīng)過數(shù)千年

they are slowly transformed into rocks.

他們逐漸轉(zhuǎn)化成巖石。

In this way, huge amount of carbon dioxide,

巨量的二氧化碳

the very gas that keeps our planet warm,

這種為地球保暖的氣體

are removed from the atmosphere.

以這種方式從大氣中被移除

So if that was the end of the story,

那么，如果故事到此為止

our planet would have run out of carbon dioxide.

我們的行星將...

and steadily got colder and colder.

逐漸變得越來越冷

But fortunately,a special type of volcanoes doesn't allow that to happen.

幸運(yùn)的是 一些特殊類型的火山 不允許這種狀況發(fā)生。

They're called subduction volcanoes.

他們叫做俯沖火山