Three Sisters Racerback Tank Top Elevation 20000 - 25000 Mount Jefferson (Seekseekqua) is a

Mount Jefferson (Seekseekqua) is a stratovolcano in the Cascade Volcanic Arc

This iconic active stratovolcano rises 14

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Three Sisters Racerback Tank Top Elevation 20000 - 25000 Mount Jefferson (Seekseekqua) is aThe Three Sisters are volcanic peaks of the Cascade Volcanic Arc in Oregon. Each exceeding 10,000 ft (3,000 m) in elevation, they are the third , fourth , and fifth highest peaks in Oregon. They are often seen as one unit, but the three mountains evolved under differing geologic situations, and the petrologic composition of each mountain can vary significantly. Whereas North Sister is extinct and Middle Sister is dormant, South Sister (most popular