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Earth's rocks and Mars's rocks

  1. Feb 12, 2008 #1
    Having trouble with some homework. Why are there no rocks found as old as Earth is (apx. 4.5bil yrs)? Why are most rocks on Mars at least 3mil yrs old?
     
  2. jcsd
  3. Feb 13, 2008 #2
    stuff happens
    rocks doNOT just sit there
    they turn to sand/dirt/dust over 4.5 B Y
    melt or get buryed and pressed into other forms
     
  4. Feb 13, 2008 #3

    mgb_phys

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    Weathering and plate techtonics
    There isn't much of Earth's surface that has been surface for 4Billion years.
    Mars is relatively inactive, the surface has largely always been the surface.
     
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