They cover one third of the land surface.

它们覆盖的三分之一。

These are surface manifestations of the incredible amount of heat that lies beneath us.

这些就是我们脚下大量热能在的呈现形式。

I'm one of the places where the earth axis intersects its surface.

我是球旋转轴同的交汇之。

Most of the animals and plants living on the surface will begin to die.

大多数生活在的动植物将开始死亡。

Or, 'twenty miles below the earth's surface', definitely not immediately under it.

再有“20英里以下”，指的绝对不是指紧挨的方。

In the gloom of the forest floor, he is a dazzling blaze of iridescent green.

在这森林的阴暗处，就是那最绚烂最夺目的一抹绿色。

So we definitely have more total living biomass on the surface than we have in the subsurface.

因此，的生物量总量肯定比在下的多。

And sediment samples brought carefully to the surface were found to contain bacteria and archaea.

科学家还发现从深海小心翼翼带到的沉积物样本里含有细菌和古代细菌。

One degree of latitude on the earth's surface equals almost 70 miles.

上的纬度一度相当将近七十英里。

When it is 5% at the surface, it can be as much as 70% eight inches down.

在的湿度只有5%，八英寸的下却能高达70%。

We're collecting temperature data below the soil surface.

我们正在收以下的温度数据。

Now this is going to represent the warm temperatures near the surface.

这代附近的较暖的温度。

The goal was to collect rock and dust samples from beneath the surface.

目的是收下的岩石和尘土样本。

The radar must detect the correct altitude from the Martian surface and tell Phoenix when to release the parachute.

雷达必须测出到火星的准确高度，并告诉凤凰号何时释放降落伞。

And with our virtual Earth, we can look inside the planet and see how it reaches the surface.

用我们的虚拟球，我们可以看到球的内部，看看它是如何到达的。

The crater has two bright areas caused by salt collections from liquid that reached the surface.

这个陨石坑有两处明亮的区域，这是由到达的液体所携带的盐分聚形成的。

It's an escape from the floods and the biting insects on the forest floor.

它可以抵御洪水来袭和森林咬人的昆虫。

But as the earth heats up, the hottest days of summer are upon us.

但随热量的累积，炎炎夏日即将到来。

The bridge is so long that the shape of the earth had to be taken into account by its designer.

由于桥身太长，设计者不得不考虑了的形状。

How does it compare to life on the surface, like biomass?

它与上的生命相比如何呢，比如生物量方面？