In most localities a given species of clam or coral persists essentially unchanged throughout a thick formation of rock, only to be replaced suddenly by a new and different species.

在大多数地方，某一种蛤蜊或珊瑚在厚厚的岩层中保持基本不变，只是突然被一个新的不同的物种所取代。

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Plate movements are the surface expressions of motions in the mantle—the thick shell of rock that lies between Earth's crust and its metallic core.

板块运动是地幔运动的表面现象。地幔是位于地壳和金属内核之间的一层厚厚的岩石壳。

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Some found areas of mountain rock thick with gold.

VOA: special.2010.04.25

It was perched on the slope of a minor mountain, about a third of the way up, with thick slabs of rock stuck under the front side, a new rock every year, to keep the house from tumbling forward into the fields of wild raspberries.

NEWYORKER: Reverting to a Wild State

Sensors suggest a 600-foot-thick zone of spongy rock holding millions of barrels.

FORBES: Magazine Article

It's the listener's job to figure it out, as Aesop Rock lays down furious rhymes amid thick production and some seriously sick sampling.

NPR: Giving the 22nd Century a Soundtrack