22 Aug

Rim diameter

Defined as the diameter of the topographic rim that rises above the surface for simple craters, or above the outermost slump block not concealed by ejecta for complex craters. This is relatively easy to measure on most planetary bodies, where the topographic rim is usually preserved due to low rates of erosion. On Earth, however, such pristine craters are rare and the rim region is typically eroded away.

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