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In this report for the National Geographic co-production of Radio Expeditions, Elizabeth Arnold follows research scientist Gordon Grant to a waterfall and lake fed by underground rivers, and to the top of Mackenzie Pass in Willamette National Forest, Oregon - a barren lava field, where water flows undergound. Along the way, they discuss the need to better understand the underground water and the role of the U.S. Forest Service to protect the water. The broadcast is 8 minutes and 55 seconds in length.
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