They may have giant stair-like terraces that are created by slumping of the walls. It can be loose materials or a blanket of debris surrounding the crater.
Circular unless hit very hard
All impact craters are circular, no matter what the shape of the impactor or the angle of impact. Of the options provided in the Discussion page, only choice "B" is accurate. The energy released in the impact melted the impactor - and the surface - to the point of being fluid, or at least malleable. Option "D", that the craters were formed early in the Moon's history, is probably also true, but the circular shape of the craters isn't dependent on this.
circle has the smallest area
It depends on its shape and size. Roughly from smallest to largest (although these things can vary), it could be an lagoon, an inlet, a bay or a gulf. If surrounded by mountains (and, most likely, located in Scandinavia), it could also be a fjord.
A lunar eclipse can only occur at the time of Full Moon.
which is the smallest bone in our body? It is the stapes located inside of the ear. It is in the shape of a D.
Craters are depressions in a planet's or moon's surface caused when a meteor hits the surface. On the moon craters remain undisturbed because there are no environmental forces like wind and rain to disturb resulting shape of the crater.
That is the lunar cycle, or the phases.
earth has a spherical shape a vast land...moon which has craters..
Circular!
curved shape. And that shape is probably a sphere.
Of coarse..... a circle