They cover one third of the land surface.

它们覆盖着地表三分之一。

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地表呈现形式。

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

我是地球旋转轴同地表交汇之地。

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

大多数生活在地表动植物将开始死亡。

And that sulphuric acid is made by sulphur dioxide coming out of volcanoes on the surface.

这些硫酸来源于二氧化硫产生于地表火山。

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

科学家还发现从深小心翼翼带到地表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.

地表上纬一相当将近七十英里。

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

在地表只有5%，八英寸地下却能高达70%。

We're collecting temperature data below the soil surface.

我们正在收集地表以下温数据。

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

这代表地表附近较暖温。

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

目是收集地表下岩石和尘土样本。

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

用我们虚拟地球，我们可以看到地球内部，看看它是如何到达地表。

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地表咬人昆虫。

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区域，这是由到达地表液体所携带盐分聚集形成。

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

因此，地表生物量总量肯定比在地下多。

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地表形状。

What goes on beneath the surface is pretty darn violent.

地表下发生事情非常暴力。

Scientists believe there might be such chemicals lying at the bottom of Europa's ocean.

科学家认为木卫二地表下床上一定存在这些化学物质。

Where would you find about 20 percent of the world's surface freshwater?

世界上20%地表淡水来自哪里?

The force can break up rock under the Earth's surface, releasing oil and gas.

所产生压力可可地表下岩石破裂达到释放石油和天然气目。