Notices
Results 1 to 2 of 2

Thread: Ocean Rock

  1. #1 Ocean Rock 
    New Member
    Join Date
    Sep 2007
    Posts
    4
    Why are continental rocks (SIAL - about 4000 million years old) so much older than the oceanic rocks (SIMA - about 200 million years old)?


    Reply With Quote  
     

  2.  
     

  3. #2  
    Forum Sophomore
    Join Date
    Jan 2007
    Posts
    158
    Oceanic rocks are recycled in to the mantle at subduction zones far more readily than continental ones.

    http://en.wikipedia.org/wiki/Subduction_zone


    Reply With Quote  
     

Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •