地球的力量 第1集 火山(4)生命起源的条件

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

看看熔岩湖岩浆快速的翻滚吧

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

它在火山口的一边涌出来 冷却后形成暗色的硬壳

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

岩浆不断的涌动使硬壳在熔岩湖表面移动

Finally, the crust sinks back down.

最后这个硬壳块又沉下去了

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

我们会发现地表以下的熔岩不断的涌动 这个过程影响了地貌

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

地球热能的作用远远不止为火山提供能源

It continually rebuilds the planet's surface

它持续不断的改造着地球地貌

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

并仓创造了地球上生命起源的条件

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

要弄明白地球内部的热能是从哪里来的

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

我们必须从45亿年前

This is the time of our planet's birth.

地球产生开始说起