The more the snow is compressed, the more air isforced out of it.

越多的雪压缩，越多的空气被挤出

Removing air is what turns fluffy snow into rock hardice.

移除空气使蓬松的雪变成坚硬的冰岩石

This is it. I've come down about 20 metres to the base of the cliff

这里，是我降到冰崖二十米下的地方

and this is pure glacial ice.

这是纯净的冰川

All those snowflake crystals in there have been squeezed down

那里的雪花结晶被填满了

and it gives this weird texture.

怪异的材质

I mean, if s just frozen water but it's Like solid rock.

我是说，它只是冻水，却像坚固的岩石

Look at that.And it's got this glassy feel to it. It's almost transparent.

看这个 如同镜面般光滑，甚至是透明的

When enough ice forms, it slowly starts to slide downhill and becomes a glacier.

当足够多的冰成型它开始缓慢从山上滑落 逐渐变成冰川

And over the last couple million years,

在过去数亿年

it's ice that has been a dominant force shaping our world,even changing the climate.

冰是塑造我们世界的统治力量 甚至改变气候

Recorded from deep within the ice,

从深入研究冰的记载中

these are the sounds of a glacier groaning and creaking

冰川的声音充满隆隆声和嘎吱声

as it slides down the mountain.

因为它们从山上滑落