Ina Structure: Age (IMAGE) Brown University Caption False color composite indicates age and composition of lunar surface features. Titanium basalts (blue) are exposed on the floor of Ina structure and in the "fresh" impact crate at left. Less mature soils (based on spectral ratios) appear in green. Credit NASA Usage Restrictions NASA still images, audio files and video generally are not copyrighted. You may use NASA imagery, video and audio material for educational or informational purposes, including photo collections, textbooks, public exhibits and Internet Web pages. This general permission extends to personal Web pages. This general permission does not extend to use of the NASA insignia logo. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.