Mystery Mounds in Southern Acidalia Planitia

This image shows bright mounds scattered throughout a rather flat, dark landscape. These mounds range approximately between 20 and 500 meters (yards) in diameter. The largest among them show central crater-like depressions, which give them an appearance similar to terrestrial volcanoes. The origin of these mounds is still unclear. The most widely accepted hypotheses involve extrusion of underlying fluid-like materials (lava, wet/icy sediments) through weak points in the surface.

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