By very carefully 'feeling' the balancing point of each rock he handles - a process that requires awesome skill and patience - Gray is able to arrange them in ways that seem incredible.

通过非常仔细地“感觉”拿着的每块石头的平衡点——一种需要非凡技巧和耐心的过程——格雷能够以似乎难以置信的方式把它们排列起来。

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Most trace elements, including manganese and arsenic, get into the water through the natural process of rock weathering.

大部分微量元素，包括锰和砷，通过自然过程中的岩石风化作用进入水体。

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Meanwhile, across the entire island, many moai are reversing the creation process and deteriorating rapidly from priceless carvings back into plain rock.

同时，整个岛的许多摩埃巨石像正在逆转创造过程，并迅速地从雕像退化为普通的岩石。

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Shale gas is extracted by tapping gas from shale rock using a process called hydraulic fracturing, or fracking.

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Those resources consist of a lot of rock, a lot of sunlight that could be used to generate electricity to process the rock and, at least in the dreams of many lunar scientists, some 20 billion tonnes of frozen water believed to lie at the bottoms of craters near the poles, where it is sheltered from the evaporative effects of sunlight.

ECONOMIST: Spaceflight

It said markets had been hit by a combination of factors including the 2011 Japanese tsunami and the USA's interest in shale gas, which is extracted from shale rock using the controversial process of fracking.

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