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Terrestrial planets have hard surfaces that can be re-shaped by several different processes: impact cratering, volcanism, erosion, and tectonics. Links to external sites will be displayed in another window. Select the photographs to display the original source in another window.
The kinetic energy of the impacting meteorite or asteroid is converted into heat, sound, and mechanical energy---the projectile explodes on impact.
The explosion is what carves out the crater so almost all craters are round (otherwise the great majority would be oblong in shape).
See the "Not Round" page from the THEMIS site for what can make an impact crater not round (links will appear in a new window).
The rock on the surface of the planet or moon is bent backward, upward, and outward so the amount of material ejected is much larger than the projectile.
Large craters will have a central peak formed by the rock beneath the impact point rebounding upward and they may also have terracing of the inner walls of the crater from the collapsing of the crater rim inward.