Natural rock joint surface profiles belong to fractal category.

自然岩石节理表面轮廓线可以看作为分形曲线。

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Joint profiles of natural rock can be considered as fractal curves.

自然岩石节理表面轮廓线可以看作为分形曲线。

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And experimental studying on natural rock simulating the phenomenon of zonal disintegration.

并进行了天然岩石模拟分区碎裂化现象的实验研究。

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The action of wind and water can form cave openings like natural rooms within the rock.

VOA: special.2009.07.20

The seawater pool was built on the site of a natural rock pool that people have used for bathing since the late 19th Century.

BBC: Shoalstone pool

In a radical experiment which he called "building without foundations", he skipped the concrete substructure and instead built the guest wing on a pre-existing natural rock formation.

BBC: An Alvar Aalto tour of Finland

About a third of a mile from the canyon top, we came upon a 150-foot natural rock arch with a keyhole view of the river far below.

WSJ: The Grand Canyon's Secret Network