1) Impact crater on Mars
Found on
https://www.crosswordclues.com/clue/bjerknes
[lunar crater] The crater rim is generally circular, but with some slight irregularities along the northeastern quadrant. The rim is relatively sharp-edged, and displays little appearance of wear. The interior floor is rough and irregular, beginning with the slumped material at the base of the inner walls. The crater is named in honor of Vi...
Found on
http://en.wikipedia.org/wiki/Bjerknes_(lunar_crater)
No exact match found.
