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Summit Cinder Cone, Lassen Volcanic National Park, California

Cinder Cone is a 700 ft (213 m) high cone of loose scoria. Scoria forms when blobs of gas-charged lava are thrown into the air during an eruption and cool in flight, falling as dark volcanic rock containing cavities created by trapped gas bubbles. It's a 5 1/2 mile hike to the top of Cinder Cone where you can marvel at a landscape transformed by volcanic activity.
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