In the heart of the continent it is almost as high as the summits of the Alps, yet soundings show that in places that rock floor is below sea level.

大陆的中心几乎与阿尔卑斯山等高，然而，超声探测显示，岩石底部的许多地点都低于海平面。

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The rock material flows up from Earth's interior here, at the split, which forces the two sides of the ocean floor to spread apart, to make room for the new rock material.

岩石物质从地球内部的裂缝处向上流动，迫使海底向两边分开，为新的岩石物质腾出空间。

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But when it wants to blend in with its environment to hide from its enemies, it can take on the color of its immediate surroundings: the ocean floor, a rock, a piece of coral, whatever.

但当它想要融入环境以躲避敌人时，它就会呈现出周围环境的颜色：海底、岩石、珊瑚等等。

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They lift their eyes to the tall rock walls that rise hundreds of meters up from the floor of the valley.

VOA: special.2010.07.05

Mister Wegener said the lighter continental rock floated up through the heavier basalt rock of the ocean floor.

VOA: special.2010.01.12

Also,the continents and the ocean floor are not made of the same kind of rock.

VOA: special.2010.01.12

It follows a major rock fall at the quarry in April 2012 that saw half a million tonnes of rock cover the quarry floor and hamper operations at the site.

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The walls were stone and the floor was rock.

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Anything substantially lower will indicate that oil is escaping through some broken piping and flowing into other rock formations below the sea floor with the possibility that it could find a way to burst through the floor into the sea from a different location.

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