... a dense core of approximately 700km radius, a molten rocky mantle denser than earths and has a thin crust. Data from Mars Global Surveyor indicates Mars' crust is about 80km thick in the Southern Hemisphere but it is only 35km thick in the Northern Hemisphere. Mars' low density suggests that te core is made up of large amounts of sulphur and iron. Is Water needed for life to exist? We have always been fascinated with the Red Planet, and we've wondered-in science fiction, in classrooms, in living rooms, and in laboratories-if anything lives there. Water is the key to many important scientific questions when dealing with Mars. As far as we know, water is vital to the existence of life on any planet. According to Gene McDonald at the Astrobiology Research Element at NASA's Jet Propulsion Laboratory (JPL), water has unique properties that make it the best solvent for the kind of chemistry ...

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