Week 5 Astronomy Review - 20:40 areaperunitofvolume...

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Week 5 Astronomy Review 20:40 Why some terrestrial planets are geologically active while others aren’t? Some terrestrial planets have volcanic or tectonic activity Some terrestrial planets are smaller than others meaning more heat-radiating surface  area per unit of volume It is due to convection of heat from planets interior core. Some interior core or more  heated than others. Why the terrestrial planets all have different geological histories? Differences arise because of planetary size: Smaller worlds cool off faster and harden earlier Larger worlds remains warm on the inside, promoting volcanism and tectonics and they  have more erosion Distance from Sun Planets close to the sun are to hot for rain, snow, and ice and have less erosion Planets far from sun are too cold for rain, limiting erosion  Planets with liquid water have most erosions Rotation rate Planets with slower rotation have less weather and less erosion and a weak magnetic  field  Planets with faster rotation have more weather and more erosion and a stronger  magnetic field  The basic differences between Terrestrial Planets and Jovian Planets Terrestrial planets:                       Jovian Planets Small                                     Large
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High density                           Low density Rocky                                    Gaseous Slow Rotation                         Rapid rotation Thin atmosphere                    Thick atmosphere Solid surface                          No solid surface Warm                                    Cold No ring system                       Ring system Few moons                            Lots of moons The differences and similarities between the surfaces of the terrestrial planets? Earths surface:  Different terrains (low and high), smooth, crust is broken up into plate  tectonics that move across the surface at different speeds. Covered in majority water.  Mercury surface:  crust is thick and heavily cratered just like the moon. No Maria  basins. Ground level. Dominated by ancient lava plains covered with craters. Dead  world meaning there is no volcanism. Has scarps (large cracks).  Venus surface:  Similar to Earth. 3 large relative regions and 2 flat plains. Mountain  ranges. 75% of surface is smooth basin. Few Craters and shield volcanoes. No plate  tectonic. Thin crust Moon’s surface:  Has craters, dead world. Crust thickness varies but is thicker than  Earth’s crust. Has low highlands and elevations. 
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  • Fall '10
  • Holtz
  • Astronomy, terrestrial planets, Astronomy Review

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