This set of images from Mars shows the handiwork of different tools on three NASA missions to the surface of Mars.

This set of images shows the results from the rock abrasion tool from NASA Mars Exploration Rover Opportunity left and the drill from NASA Curiosity rover right.

This set of images compares rocks seen by NASA Opportunity rover and Curiosity rover at two different parts of Mars.

An artist concept of NASA Mars Science Laboratory left serves to compare it with Spirit, one of NASA twin Mars Exploration Rovers