Ozone forms a protective layer between 12 and 30 miles above the Earth's surface.

臭氧在距地球表面12至30英里的地方形成一个保护层。

《柯林斯英汉双解大词典》

So sediment is transported and then deposited and it forms layers on the Earth's surface over time.

所以沉积物被运输，然后沉积，随着时间的推移，它在地球表面形成了层。

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Earth's surface is not made up of a single sheet of rock that forms a crust but rather a number of "tectonic plates" that fit closely, like the pieces of a giant jigsaw puzzle.

地球表面并不是由构成地壳的单块岩石构成，而是许多紧密相连的“构造板块”，像一块巨大的拼图。

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"Well,one of the things that's interesting about these flexible sheets is that they can be curved, so you could imagine putting them in unconventional forms, like on the surface of a vehicle or something like that, where you don't have a flat surface."

VOA: standard.2010.02.19

The ice then melts, leaving a space below the surface, which caves in under the stress of vehicles and eventually forms a pothole.

BBC: Jetpatchers at work

And only 10% of the life forms inhabiting that unknown world are known to those on the surface.

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According to a new computer model, liquid methane in contact with a partially hydrogen-terminated diamond surface at extremely high pressures and temperatures spontaneously forms longer hydrocarbons, and hence the material of crude oil could be formed deep in the earth.

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