a scale ranking ten minerals from softest to hardest; used in testing the hardness of minerals. Define DENSITY: A measure of how much matter there is in a given amount of space.
Jerusalem is a hilly city so the altitude varies but it is approximately 750 Meters (2,500 feet) above sea level.
Spectacular events determined the highest and lowest elevation points on Mars. The lowest point was blasted by an enormous asteroid impact which formed the Hellas Impact Crater. The highest point was built by repeated eruptions of Olympus Mons, the largest volcano in our solar system.