+ NASA Homepage + NASA en Español + Marte en Español + Mars Home + MER Home Spacecraft Mars Artwork Craters Martian Terrain Mars Artwork Return to Artwork index Large JPG (161 kB) The rock abrasion tool on the robotic arm grinds away the rock's surface, allowing scientific instruments to analyze the rock's interior. + Freedom of Information Act + The President's Management Agenda + FY 2002 Agency Performance and    accountability report + NASA Privacy Statement, Disclaimer, and    Accessiblity Certification + Freedom to Manage Last Updated: + Comments and Questions