There are element maps produced by the prospector mission. You should fine them on google.<br /><br />It shouldbe possible to map particle size variations with things like radar. I am not sure if this has been done for the whole moon though, nor how well it differentiates the finer sizes.<br /><br />These sort of questions are why we need to go back to the Moon.<br /><br />As to a virus in the ice, I woul d say it is extremely unlikely. The virus would have to get into the ice, and then remain viable over millions perhaps billions of years. It would then have to be sufficiently compatible to life on Earth to cause a disease. Virii have very precise biochemical behaviour that rarely crosses species boundaries, even more rarely class boundaries, and never that of phyla. We don't get tobacco moisaic virus, and tobacco plants don't catch colds.<br /><br />The composition of organic species in the ice will be of great interest to astrobiologists. So the first ice samples will be handled very carefully to avoid contamination and allow anaysis of the ices and the materials in it. This would been collection by sterile and ultraclean tools and storage in ultraclean sterile containers that are kept at cryogenic temperatures and then handling in ultraclean labs. This shoudl be able to identify any pathogens - should they exist, which, as I have said it astronomically unlikely.<br /><br />Jon <div class="Discussion_UserSignature"> <p><em>Whether we become a multi-planet species with unlimited horizons, or are forever confined to Earth will be decided in the twenty-first century amid the vast plains, rugged canyons and lofty mountains of Mars</em> Arthur Clarke</p> </div>