Menan Buttes volcanoes (centre), Idaho, USA, satellite image. These are two of the largest tuff cones in the world. Tuff cones are formed when magma erupts through water, in this case freshwater from the Snake River. They were formed approximately 10,000 years ago and are now extinct. Image obtained by the Advanced Land Imager (ALI) aboard the Earth Observing-1 (EO-1) satellite.
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