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.
The average elevation of the north rim is about 8,000 feet (2,438 meters) with the highest point, Point Imperial, being 8,800 feet (2,682 meters). The depth of the Canyon at the South Rim, near Grand Canyon Village, measures almost a vertical mile, about 5,000 feet (1,524 meters).