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| Description: Planets are composed of Gases Hydrogen Helium Rocks Silicate minerals Metallic iron Planets are composed of Ices Ammonia (NH3) Methane (CH4) Carbon dioxide (CO2) Water (H2O) Due to their surface gravities, Venus and Earth retained atmospheric gases Due to frigid temperatures, the Jovian planets contain a high percentage of ices Diameter of 3475 kilometers (2150 miles) is unusually large compared to its parent planet Density 3.3 times that of water Comparable to Earth’s crustal rocks Perhaps the Moon has a small iron core Gravitational attraction is one-sixth of Earth’s No atmosphere Tectonics no longer active Surface is bombarded by micrometeorites from space which gradually makes the landscape smooth Picture Stats: Views: 606 Filesize: 2.2MB Height: 958 Width: 988 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39868 |