In the Cascades of Southern Oregon, 6,173 feet above the Pacific Ocean to the west, a lake of perfect blue fills a void where a peak once stood. Roughly 7,700 years ago, a stratovolcano called Mount Mazama erupted cataclysmically, so enthusiastically spewing its contents that it gave away its foundation in the process. As the magma chamber emptied, the 12,000 foot peak collapsed in on itself, losing a mile of its height as it subsided into a caldera five miles across. Over time, this self-contained...
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