If I want to compare the ages of planets based on basalts, where should I get a sample?​

1b: Establish a precise absolute chronology for the Planet/Moon;

2d: Characterize the thermal state of the interior and elucidate the workings of the planetary heat engine;

3d: Quantify the local and regional complexity of the current  crust;

5a: Determine the origin and variability of  basalts; and

5d: Determine the flux of  volcanism and its evolution through space and time

the answer is the

let that person have a turn to speak : )