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Newly Discovered Caves Aid Researchers Study Melting Glacier

Two explorers have discovered more than a mile of caves underneath a glacier on Mt. Hood near Portland, Oregon. They suspect the beautiful formations account for a significant loss of the glacier's ice, and they have set out to measure how much the inside of the glacier is melting each year. It's dangerous work, but it could reveal that some glaciers in the Pacific Northwest are retreating faster than anyone realized.