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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They also looked at pictures of a leaf, shell, or rock.

他们也观看树叶，贝壳或石头的图片。

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In one experiment 3-year olds looked at pictures of a fork, teddy bear, truck, and other human-made objects. They also looked at pictures of a leaf, shell, or rock.

在一项实验中，让一些三岁的孩子去看叉子、泰迪熊、卡车和其他一些人造的东西的图片，也让他们看树叶、贝壳和石头的图片。

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Other pieces incorporate ivory, agate, shell, and rock crystal.

BBC: Entertainment & Arts

The 75 objects on display will include antique ornaments made of ivory, shell, and rock crystal along with modern jewelry made of diamonds, emeralds, sapphires, rubies and pearls became fashionable in later years.

FORBES: Boston MFA to Open New Gallery with Jewelry Exhibit

On federal lands, Shell has been researching methods to cook oil out of the shale (basically oil-soaked rock) without mining it or polluting groundwater.

FORBES: OutFront