1) City of Russia 2) City in Asia 3) City of Asia 4) City in Russia 
[crater] This is a worn and eroded crater formation, with a pair of small craters lying across the northern rim, and a generally worn and pitted rim and inner wall. A small crater lies along the northern inner wall and a bowl-shaped crater at the northwest edge of the interior floor. There is a small, elongated central ridge near the midpoi...
1903–60, Soviet nuclear physicist.