This limestone country is laced with underground rivers and when the jungle roof caves in, it creates these enormous sinkholes.

这个石灰岩地质的国家地下河流蜿蜒流淌，地表茂密的森林形成这些巨大的灰岩坑。

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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。

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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。

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You bring iron ore from one part of the planet, carbon, limestone, you put it into this reactor and you ship this all over the world.

你得到钢铁从地球的一个地方，还有碳，石灰岩，将它们放入这个反应器,你将它运送到世界各地。

麻省理工公开课 - 固态化学导论课程节选

This is the calcination of limestone.

石灰石的烧结，在900度烧结。

麻省理工公开课 - 固态化学导论课程节选

The best place to see this collection is in a converted limestone mine 60 meters beneath the western Pennsylvania countryside.

FORBES: The smother of invention

Usually this layer is a soluble carbonate rock, such as limestone or its purer form, chalk.

BBC: Who, What, Why: How are sinkholes formed?

This gorge wriggles through the Picos for 11km, with limestone cliffs and mountain slopes rising up to 1, 500m overhead.

BBC: Spain��s mountains made of cheese