Your age estimate for hadriaca patera is based on the density of craters equal to or larger than 500 meters in size. why did we select that size limit for this image? we asked you to focus on 500 + meter craters because there are enough of them present in a field of this size and this age to give a statistically useful answer. how would your age estimate change if you studied craters down to a limit of 250 meter? calculate a second age estimate based on these craters, and compare it to your first value. do they agree?