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Chapter 23.2ppt

Chapter 23.2ppt






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    Chapter 23.2ppt Chapter 23.2ppt Presentation Transcript

    • The Terrestrial Planets
    • Mercury: Innermost Planet
      • Second smallest
      • Absorbs most of the sunlight and reflects only 6 percent back into space
    • Mercury’s Surface Features
      • Cratered highlands
      • Very dense (contains a large iron core for its size)
      • Has very long scarps (deep slopes) that cut across plains and craters
        • Scarps: result from crustal changes as the planet cooled and shrank
    • Mercury’s Surface Temperature
      • Revolves around the sun quickly but rotates slowly
        • One rotation is 59 Earth-days
          • One night last about a month
            • Temperatures drop to -173°C
          • One day last about a month
            • Temperatures rise to 427°C
      • Mercury has the greatest temperature extremes of any planet
    • Venus: The Veiled Planet
      • Named for the goddess of love and beauty
      • Orbits the Sun once every 255 Earth-days
      • Similar to Earth in size, density, mass, and location in the solar system
      • Considered “Earth’s twin”
    • Venus’ Surface Features
      • Covered in thick clouds that visible light can not penetrate
      • Shaped from basaltic volcanism and tectonic activity
      • 80 percent of Venus has plains of old volcanic flow
      • 8 percent of Venus has highlands
    • Venus’ Surface Temperature
      • Greenhouse effect heated the atmosphere to 475°C
        • Atmosphere is 97 percent carbon dioxide, a green house gas
    • Mars: The Red Planet
      • The Martian atmosphere
        • 1 percent the density of Earth
        • Made up of mostly carbon dioxide and small amounts of water vapor
        • Dust storms cause color changes observed from Earth
          • Hurricane forced winds up to 270 kilometers per hour
        • Very cold
    • Mars’ Surface Features
      • Large volcanoes
        • The Olympus Mons is the size of Ohio and 23 kilometers high (2 and ½ times larger than Mt. Everest)
      • Has canyons much larger than the Grand Canyon
    • Water on Mars
      • Some areas show drainage patterns
      • Some indications show groundwater has recently migrated to the surface
        • Some of the escaping water have frozen due to the temperatures that range from -70°C and -100°C