英语听力：自然百科 佛罗里达州的温泉（一）

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This is water as perfect as it comes, pure enough for locals to drive a hole in the ground and drink. The source is rain. The rain embarks⁵ on a long journey which will take it underground, then eventually turn it into spring water.

 

Nearly all rivers in Florida run underground. When it rains, the water absorbs acids from plants and soil. These acids dissolve the limestone bedrock, opening up new cavities, forming tunnels below.

 

Underground, the water releases its minerals drop by drop, forming stalactites. Entering this underworld, one is transported to a wholly different place, it is not teeming⁶ with life, it's as dark and still as the moon. These tunnels are among the last explored places on earth. Divers⁷ daring and able enough are lured⁸ in search of the unknown. Their risks have paid off. These tunnels in caves have offered up some amazing discoveries, like this blind cave crayfish. Scientists have determined⁹ that they can live here for more than 100 years, 20 times longer than their surface cousins. No one can explain why.

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