N.M. cavers chart unique 'snowy' river of crystals

(AP) -- Hundreds of feet beneath Earth's surface, a few seasoned cave explorers venture where no human has set foot. Their headlamps illuminate mud-covered walls, gypsum crystals and mineral deposits. The real attraction, though, is under their shoes.

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<p><a href="http://www.physorg.com/news136096620.html">N.M. cavers chart unique 'snowy' river of crystals</a></p> <p>(AP) -- Hundreds of feet beneath Earth's surface, a few seasoned cave explorers venture where no human has set foot. Their headlamps illuminate mud-covered walls, gypsum crystals and mineral deposits. The real attraction, though, is under their shoes. </p>