I've been doing a bit of hiking, and a recent excursion took me down in a ravine where a stream flowed down from the top of the volcano. Investigation of what appeared to be a small patch of snow turned out to be an entire cave carved out of snow. Actually, it was a tunnel. The snow had hardened into ice, and insulated by layer of natural mulch, it had survived the summer. From above, the mulch camouflaged the existence of the tunnel. It was so interesting to discover this and see the tiny stream that had carved out the ice from below!
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