The area is being quarried for limestone.
这地方正在开采石灰石。
The large limestone caves are also quarried for cement.
这些大石灰岩洞也用来开采水泥原料。
The basic ingredients are limestone and clay in the proportion 2:1.
基本成分是石灰石和黏土，比例为2:1。
The local limestone is so porous that all the rainwater immediately sinks below ground.
当地的石灰岩如此多孔以致所有的雨水很快渗到地下。
The limestone is sufficiently fissured for tree roots to have breached the roof of the cave.
石灰岩裂开了足以让树根突破洞顶。
Cement is made from limestone.
水泥是由石灰石制成的。
It's the deepest limestone cave in the U.S.
它是美国最深的石灰岩洞穴。
Yes, so there's two kinds of limestone caves.
是的，所以有两种石灰岩洞穴。
Sulfuric acid eats away at limestone very aggressively.
硫酸对石灰石的侵蚀非常厉害。
We've said that sulfuric acid dissolves limestone, right?
我们说过，硫酸可以溶解石灰石，对吗？
Part of the limestone rock layer is permeated by water from below.
下面的水渗入了部分石灰岩岩层。
With a little help from this carbonic acid, moving water forms most of the world's limestone caves.
在这种碳酸的帮助下，流动的水创造了世界上大部分的石灰岩洞穴。
There are wide passages, narrow ones at all different depths, like underground tunnels in the limestone.
在所有不同的深度都有宽阔、狭窄的通道，就像石灰岩中的地下隧道。
Most limestone and sandstone aquifers are deep and extensive but may contain groundwaters that are not being recharged.
大部分的石灰岩和砂岩的蓄水层都是深而广的，但可能含有不可再生的地下水。
Most limestone and sandstone aquifers are deep and extensive, but may contain groundwaters that are not being recharged.
大多数石灰岩和砂岩的蓄水层很深并且规模很大，但是它们含有的地下水可能是当前无法再生的。
These are generally fed by groundwater springs, and many issued from limestone massifs, such as the Atlas Mountains in Morocco.
它们通常由地下泉水供养，其中许多流自石灰岩山丘，如摩洛哥的阿特拉斯山脉。
The danger is likely to continue, they say, until the waves reach an inland area of hard rock which will not be eaten as limestone is.
他们说，这种危险可能会持续下去，直到海浪到达内陆坚硬的岩石区域，这些地方的岩石不会像石灰岩那样受到侵蚀。
This gas is hydrogen sulfide, rises up and mixes with oxygen in the underground water that sits in the cracks and fissures in the limestone.
这种气体是硫化氢，上升后与石灰岩裂缝中地下水的氧气混合。
Another difference, very important today for distinguishing between older lake beds and newer ones, is the location of the limestone formations.
如今在区分新老湖床方面非常重要的另一个不同点在于石灰岩地层的位置。
So we have been fairly thorough in our discussion about coral reefs, which of course are prominent, oceanic features made of hard limestone skeletons produced by tiny coral animals.
我们对珊瑚礁的讨论已经相当深入了；显然，珊瑚礁具有显著的海洋特征，由小型珊瑚动物制造的石灰骨架构成。
When I was researching this for a study a few years ago, I visited a couple of these typical limestone caves, and they were all very wet, you know, from streams and rivers.
几年前我做这项研究时，我探访了其中几个比较典型的洞穴，它们都很潮湿，你们也知道这是因为小溪和河流的缘故。
Solutional processes have widened and deepened the grykes of the limestone pavement.
溶蚀作用使石灰石路面的灰岩深沟变宽变深。
The rest of the cave is made of limestone.
其余的都是由石灰岩组成。
Most caves are formed by limestone, a carbonate rock.
大多数洞穴是由石灰岩形成的，这是一种碳酸盐岩。
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