每年，他们繁衍增生形成巨大的雾霭
that color the ocean green.
海洋为之变绿
The ocean absorb carbon dioxide from theatmosphere
海洋从大气层中吸收二氧化碳
and the plankton use this carbon for both photosynthesis and to make their shells.
浮游生物的生长消耗二氧化碳
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。经过数千年
they are slowly transformed into rocks.
他们逐渐转化成岩石。
In this way, huge amount of carbon dioxide,
巨量的二氧化碳
the very gas that keeps our planet warm,
这种为地球保暖的气体
are removed from the atmosphere.
以这种方式从大气中被移除
So if that was the end of the story,
那么，如果故事到此为止
our planet would have run out of carbon dioxide.
我们的行星将...
and steadily got colder and colder.
逐渐变得越来越冷
But fortunately,a special type of volcanoes doesn't allow that to happen.
幸运的是 一些特殊类型的火山 不允许这种状况发生。
They're called subduction volcanoes.
他们叫做俯冲火山
