地球的力量 第1集 火山(4)生命起源的條件

Just take a look at the motion of the lava lakesspeed up,

看看熔巖湖巖漿快速的翻滾吧

it wells up from one side of the crater and forms adark crust as it cools.

它在火山口的一邊涌出來(lái) 冷卻后形成暗色的硬殼

Then this crust moves across the surface of the lake driven by the churning action of the lavabelow.

巖漿不斷的涌動(dòng)使硬殼在熔巖湖表面移動(dòng)

Finally, the crust sinks back down.

最后這個(gè)硬殼塊又沉下去了

this process of molten rock churning away below the surface effects our entire planet on ablobal scale.

我們會(huì)發(fā)現(xiàn)地表以下的熔巖不斷的涌動(dòng) 這個(gè)過(guò)程影響了地貌

But the Earth's heat does far more than simply fuel volcanoes.

地球熱能的作用遠(yuǎn)遠(yuǎn)不止為火山提供能源

It continually rebuilds the planet's surface

它持續(xù)不斷的改造著地球地貌

And it created the conditions for life on Earth to begin.

并倉(cāng)創(chuàng)造了地球上生命起源的條件

To understand where our planet's immense inner heat comes from,

要弄明白地球內(nèi)部的熱能是從哪里來(lái)的

we have to go back four and a half billion years.

我們必須從45億年前

This is the time of our planet's birth.

地球產(chǎn)生開(kāi)始說(shuō)起