Mountains are the result of tectonic forces pushing the crust upward and erosion tearing some of that crust down. The resulting pattern is a fractal.

地质构造作用力向上抬升地壳，侵蚀再将地壳撕得支离破碎，山脉从此形成，同时也产生了分形图案。

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However, the crust is almost four times thicker than the earth's crust.

然而，月球地壳几乎是地球地壳厚度的四倍。

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Here Earth's crust pulls apart, and upwelling magma cools and forms new crust that spreads away from the ridge in the great recycling process known as plate tectonics.

地壳在这里碰撞挤压，上涌的炙热岩浆变冷，又形成了新的地壳，这种伟大的循环过程就是所谓的板块构造。

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"This one is beautiful. This is one of my favorite rocks. You can see that black stuff on the outside, it's called the fusion crust.

VOA: special.2010.07.28

And, seawater contains only 3.7% of the total magnesium present 7% in the Earth's crust.

而海水只含有,地表镁总量的,3。

麻省理工公开课 - 固态化学导论课程节选

Soon the sun's warmth makes them shed crystal shells - Shattering and avalanching on the snow crust-- Such heaps of broken glass to sweep away You'd think the inner dome of heaven had fallen.

阳光的温暖接着使那水晶的硬壳,从树枝上崩落，一齐倾泻在雪地上-,这么一大堆碎玻璃尽够你打扫,你还以为是天顶的华盖塌了下来。

耶鲁公开课 - 现代诗歌课程节选

It starts from the crust and then the toppings, you know, are important, but if they're not on a great crust, then it's really not gonna be a great or memorable pizza.

NPR: Pizza Goes Back to Its Roots

While he loves a chewy, old-school Neapolitan-style crust and suggests letting your dough rise overnight for fuller flavor, Mr. Vetri has also developed a simpler Romana-style dough that forgoes the use of a yeast starter and shines in thin-crust preparations.

WSJ: Homemade Pizza Recipes: Pizza Perfect

Chef Gabriele Bonci uses 200-year-old starters for his sourdough, making for a deliciously fluffy crust.

BBC: Where to eat when Rome shuts down