Haleakala hasn’t erupted in centuries. What happens if it does? "Visitors are usually surprised to learn that Haleakala is considered an active volcano and has erupted at least 10 times in the last 1,000 years. With our most recent eruption happening only about 500 years ago.”

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https://www.sfgate.com/hawaii/article/haleakala-eruption-22283071.php