Also, in surface water, there is a weak acid, carbonic acid, not sulfuric acid but carbonic acid that helps dissolve the rock. With a little help from this carbonic acid, moving water forms most of the world’s limestone caves.

另外，在地表水中，有一种弱酸，碳酸，有助于溶解岩石的不是硫酸而是碳酸。在这种碳酸的帮助下，流动的水形成了世界上大部分的石灰岩洞穴。