One of the most awe-inspiring members of the Ring of Fire—the the global arc that contains 75 percent of the world's active volcanoes—is Oregon's Crater Lake National Park. Its namesake is the deepest lake in the United States, but it's not connected to any rivers—all of its water comes from precipitation. That's why it's such a striking shade of blue.
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Written by Curiosity Staff June 28, 2017
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