Mars may have experienced episodic FLOODING millions of years ago,

A: The low-frequency radar imaging profile, with the black line denoting the topography relative to the landing site. The dashed line above 10 m denotes the estimated bottom of the regolith top layer. The two lines at depths of around 30 and 80 m represent the boundary between the second and third layers and the base of the third layer, respectively. The two dashed lines at around 10 and 40 m deep roughly separate finer-grained and coarser-grained rocky blocks within the second and third layers, respectively. B: The composition of the layers from the radar data

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