Counting craters to estimate the age of a surface

The exercise from which these materials was taken was written by J. Hurtado at UT El Paso.

• http://www.geo.utep.edu/pub/hurtado/public/hurtado_planetary_science_exercises/lab5.pdf

A picture from Mars' Northern Hemisphere, with area 812,250 square km.

A picture from Mars' Southern Hemisphere, with area 774,250 square km.

Put your results into this table:

And place two sets of symbols:

• circles for the Northern hemisphere measurements
• squares for the Southern hemisphere measurements

on this graph. Place each symbol in the middle of its range of diameters.