Three examples are shown here.
Illumination is from the left.
Illumination is from the upper left. Illumination is from the upper left. If you have ever visited the famous Meteor Crater in northern Arizona, U.S.A., then you are aware of its immense size on a human scale. Each crater was formed by the impact and explosion of a meteorite at some time in the martian past. After each crater formed, it was modified by wind and erosion.