North Sister volcano, along with Middle and South Sister part of the Three Sisters Group in central Oregon Cascades. The group forms a prominent landmark in the Central Oregon Cascades.
North Sister is the glacially eroded remnant of a andesitic-dacitic stratovolcano, exposing the volcano's central plug.
Middle Sister volcano, also over 3000 m in elevation, is located only 2 km to the south. It is basaltic-to-rhyolitic in composition and less eroded than North Sister, but there are no known eruptions in the past 10,000 years.
Raung volcano photos: One of the largest and most active volcanoes in East Java, rarely-visited and relatively unknown Raung became (in)famous during its recent eruption in 2015 when its frequent ash plumes forced the repeated closure of Bali's airport.
Stromboli volcano photos: The lighthouse of the Thyrrhenian Sea - thanks to its typical, regular explosions that coined the term "strombolian activity", Stromboli is one of the most famous and photogenic volcanoes in the world.
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