Craters are known to be cause by the collision of a meteorite with the Earth. It is true because the surface with fewer impact craters is said to be a new surface.
The factor that account for the stark contrast in impact crater density on bordering regions of Ganymede in the photo is because since it has not been impacted as many times as the older surfaces.
The impact craters are therefore too hard to recognize as a result of weathering and erosion of its surface.
The Moon is known to lacks water, atmosphere, and tectonic activity of which these factors or forces often erode Earth's surface and erase some new impacts.
The impact crater is often influenced by the appearance of impact craters and ejecta are said to be the size and velocity of the impactor.
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