Strange Rocks on Mars . ... Credit Copyright: IMP Team , JPL , NASA Explanation: The rocks on Mars tell us stories about their past. To decipher these stories, a scientist must become a detective , searching for clues and fitting them with theories. ... For example, at least three types of rocks are evident, marked with red, white and blue arrows. ... The white areas are more mysterious, and might be some sort of composite material. ... NASA Web Site Statements, Warnings, and Disclaimers . ...