'Scalloped' depressions as indicators of subsurface ice
'Scalloped' depressions as indicators of subsurface ice
This close-up from the HiRISE instrument aboard the Mars Reconnaissance Orbiter shows several stepped depressions formed by the disappearance of subsurface ice. Their shape resembles scallop shells, hence the term 'scalloped depressions' in scientific jargon.
Credit:
NASA/JPL/Univ. of Arizona