A giant raft of rock may once have floated across Mars’ ancient ocean

Mars could have had an ancient ocean in its northern hemisphere, and a large raft of volcanic rock may have floated across it to settle into mounds we can see today

Source:
https://www.newscientist.com/article/2241189-a-giant-raft-of-rock-may-once-have-floated-across-mars-ancient-ocean/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home