The rest of the cave is made of limestone.(其余的都是由石灰巖組成。)

Most caves are formed by limestone, a carbonate rock.(大多數洞穴是由石灰巖形成的，這是一種碳酸鹽巖。)

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.(我們對珊瑚礁的討論已經相當深入了；顯然，珊瑚礁具有顯著的海洋特征，由小型珊瑚動物制造的石灰骨架構成。)

These are generally fed by groundwater springs, and many issued from limestone massifs, such as the Atlas Mountains in Morocco.(它們通常由地下泉水供養，其中許多流自石灰巖山丘，如摩洛哥的阿特拉斯山脈。)

Most limestone and sandstone aquifers are deep and extensive but may contain groundwaters that are not being recharged.(大部分的石灰巖和砂巖的蓄水層都是深而廣的，但可能含有不可再生的地下水。)

We've said that sulfuric acid dissolves limestone, right?(我們說過，硫酸可以溶解石灰石，對嗎？)

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.(幾年前我做這項研究時，我探訪了其中幾個比較典型的洞穴，它們都很潮濕，你們也知道這是因為小溪和河流的緣故。)

Cement is made from limestone.(水泥是由石灰石制成的。)

It was formed as a limestone cave during the glacial period.(它是于冰河時期形成的石灰巖洞。)

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.(這種氣體是硫化氫，上升后與石灰巖裂縫中地下水的氧氣混合。)