"A karst aquifer is a lot like a set of pipes, the problem is that there's no record on where the pipes are, a lot of them are broken, a lot of them have weird twists and turns in them, and we ...

It covers a quarter of the United States, and almost as much of the entire world. It results in the creation of most caves visited each year by millions of tourists around the globe, including the ...

It covers a quarter of the United States, and almost as much of the entire world. It results in the creation of most caves visited each year by millions of tourists around the globe, including the ...