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South Sister stands at an impressive elevation of 10,358 feet, making it the third highest peak in the state. What makes it particularly fascinating is that it is a stratovolcano, which means it was formed from multiple layers of lava flow, ash, and volcanic rock, and it last erupted around 2,000 years ago.
South Sister stands at an impressive elevation of 10,358 feet, making it the third highest peak in the state. What makes it particularly fascinating is that it is a stratovolcano, which means it was formed from multiple layers of lava flow, ash, and volcanic rock, and it last erupted around 2,000 years ago.
