A multiringed basin is a large impact feature surrounded by a series of concentric rings. Examples include Mare Orientale
on the Moon, the Caloris
Basin on Mercury, and Valhalla and Asgard
on Callisto. The rings are similar to the
ripples caused by throwing a stone into a pond; they are the peaks and troughs
of rock made molten by the impact, which then froze in position as it cooled.
|Mare Orientale on the Moon
GEOLOGY AND PLANETARY