NASA's Landsat 5 satellite captured this true-color image of Crater Lake National Park in South-Central Oregon last September. The lake, which formed some 7,700 years ago when Mt. Mazama collapsed following an absolutely massive volcanic eruption. The walls of the volcano collapsed and over centuries filled with water from rain and snowfall. At around 1,900 feet deep, it is the deepest lake in the country. The underlying volcano is still active and will likely erupt again, though not on a scale like that of the eruption that created the lake.

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Image: NASA.