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RTcosmochronology
 geochronology
 planetology
 exposure age
 relative age
 impact features
 extraterrestrial geology
 impact craters
 meteor craters
 landform evolution
 erosion rates
 surface features
 cratering
 regolith
 denudation
 erosion surfaces
SNGenerally used for impact erosion and/or depositional processes on extraterrestrial planetary bodies on a global scale. Also index cratering if applicable. Added to Thesaurus in 1995.