Pretty Good Lakes Part 2: Crater Lake is one of the deepest lakes on the planet, and the reason why is fascinating. Located inside of a dormant volcano, Crater Lake formed as the result of the largest volcanic eruption in North America in the last half million years. Around 7,700 years ago, Mount Mazama experienced a catastrophic eruption that caused the mountain to collapse in on itself, forming a giant hole in the ground. In the thousands of years since, that hole has filled in with rainfall a

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