South Sister (also known as Charity) is the highest and youngest of the Three Sisters volcanic group in the central Cascades, Oregon. It dominates the landscape and is a popular destination for climbers and hikers.
Blue flames of burning sulfur: Ijen volcano in East Java has one of the most impressive sulfur deposits on earth. They are so hot that the sulfur often ignites - a mysterious display at night caught on camera.
Introduction to Plate Tectonics: The Earth's upper, rigid layer is broken into several plates which are in constant motion to one another. Most earthquakes and volcanoes occur as result of these plate boundaries.
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