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									    Density

In the solar system
                          Density on Earth

  Density of air 0.0012 g/cm3 (sea level at 15° C)




             Density of water 1.0 g/cm3

Changes in temperature, humidity and salinity
  can change the density of water and air
                    Density on Earth
                             Igneous rocks




                     Density of rocks
                      2.2-3.3 g/cm3


Sedimentary rocks                            Metamorphic rocks
 Density of Earth




Average Density 5.5 g/cm3
               Density of Earth




Density is one of the clues geologists have used to help
      understand the internal structure of Earth
                          Inside Earth




  Seismic waves from earthquakes passing through Earth provide
important information about the size and characteristics of each layer.
                    Inside Earth

 Using these and
 other pieces of
    evidence,
 geologists have
   been able to
create a model of
 Earth’s internal
                                       15
                       Density g/cm3

    structure.
                                       10
                                       5
                          Inside Earth


       Inner
       Core
                       Outer
                       Core




                                               Mantle


  Seismic waves from earthquakes passing through Earth provide
important information about the size and characteristics of each layer.
Comparison of Earth
   and Moon

  The mass and
  volume of Earth
  are much larger
  than the mass and
  volume of the
  Moon.

  What about
   density?
Comparison of Earth
   and Moon

 What can we infer
     about the
 composition and
 internal structure
    of the Moon
    based on its
 density compared       Moon
     to about
  What Earth?       Average Density
                       3.4 g/cm3          Earth
    density?                          Average Density
                                         5.5 g/cm3
                    Mercury                             vs.   Ganymede




                Average Density                               Average Density
                  5.43 g/cm3                                    1.94 g/cm3
Credit: NASA/Johns Hopkins University Applied Physics
Laboratory/Carnegie Institution of Washington                                   Credit: NASA
                    Mercury                             vs.   Ganymede



                          What can we infer about the
                         compositions of Mercury and
                           Ganymede based on their
                                  densities?

                Average Density                               Average Density
                  5.43 g/cm3                                    1.94 g/cm3
Credit: NASA/Johns Hopkins University Applied Physics
Laboratory/Carnegie Institution of Washington                                   Credit: NASA
                 Mercury                    vs.     Ganymede




             Rock surrounding a                   Icy shell surrounding a
               large iron core                    small rocky mantle and
                                                    small metallic core
Image courtesy of Windows to the Universe                              Credit: NASA
                          The DAWN spacecraft will determine
                             the mass of Vesta and Ceres by
                           measuring each asteroid’s gravity.

                                                         Calculating average
                                                         density using the
                                                         mass will give us
      1 Ceres                                            information about
  Diameter = 606 miles
                                                         their internal structure
                                       4 Vesta
                                  Diameter = 348 miles

Vesta arrival:   July, 2011
Vesta departure: July, 2012
Ceres arrival:   February, 2015


http://dawn.jpl.nasa.gov/

								
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