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Last updated on April 20, 2014 at 8:28 EDT
Acidalia Planitia
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Acidalia Planitia

October 12, 2009
The small mounds with summit depressions in the northern portion of this image have an unknown origin. Some scientists think they may be cinder cones, while others think they may be pseudocraters, formed by the interaction of lava and ice. These features are also observed in other areas of Mars' northern plains, such as Isidis Planitia.