How Was Crater Lake, Oregon Formed

question 36

Multiple Choice

How was Crater Lake, Oregon formed?

• A) caldera collapse of the top of Mt. Mazama after the eruption 7700 years ago partly emptied the magma chamber
• B) when sea floor spreading permitted seawater to flood into the newly formed volcanic rift
• C) as a remnant of the "great flood"
• D) a prehistoric eruption of Mount St. Helens

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