The location and extent of aquifers is dependent upon the geological conditions of the underlying rock.

含水层的位置和范围是根据下垫岩石的地质条件所决定的。

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But the glacier is now receding, so a draft agreement has been proposed to create a new border that coincides with the ridge of the underlying rock.

然而，如今的冰川正一点点退去，因此一份协议草案摆了上来，提出以地下岩石山脊为新界限。

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The resulting composite is the most detailed and accurate portrait of the US land surface and the ages of its underlying rock formations yet displayed in the same image.

整和之后，可以从一张图片上得到详细和准确的美国大陆图和大陆下面岩石形成的年代。

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Brushing away the dust gives the robot's survey instruments a clearer view of the texture and chemistry of the underlying rock.

BBC: Curiosity Mars rover deploys its rock brush

The acquisition will allow Chevron to gain a foothold in the Marcellus shale, a giant rock formation underlying Pennsylvania, New York and other states that has become one of the most prolific sources of natural gas in the U.S. But how much equity value does this really add to the company?

FORBES: Chevron's Natural Gas Push Has Limited Upside For Stock

Even then all can be lost due to the shifting legal terrain underlying fossil collection, as in the famous case of "Sue, " the rock star of T. rex skeletons.

FORBES: Fossil Hunting