Notices
Results 1 to 5 of 5
Like Tree1Likes
  • 1 Post By exchemist

Thread: I need help with the earth's crust

  1. #1 I need help with the earth's crust 
    New Member
    Join Date
    Jul 2013
    Location
    Somewhere between the pit of man's fear and the summit of his knowledge
    Posts
    3
    I don't really know how to explain this but how did the earth's crust form I guess. I know that the earth was a shitstorm of magma and lightning and the magma was cooled to form the tectonic plates but how would the plate be shaped, what would/could have cooled the magma, what would the terrain be like, and how would the have moved. Any help or hell even speculation would be much appreciated.


    Reply With Quote  
     

  2.  
     

  3. #2  
    Suspended
    Join Date
    Nov 2012
    Location
    Apocalyptic Paradise
    Posts
    6,613
    Props for describing the early Earth as a 'shitstorm." That's the best scientific description, ever.


    Reply With Quote  
     

  4. #3  
    exchemist
    Join Date
    May 2013
    Location
    London
    Posts
    3,519
    Quote Originally Posted by Casmo82 View Post
    I don't really know how to explain this but how did the earth's crust form I guess. I know that the earth was a shitstorm of magma and lightning and the magma was cooled to form the tectonic plates but how would the plate be shaped, what would/could have cooled the magma, what would the terrain be like, and how would the have moved. Any help or hell even speculation would be much appreciated.
    Cooling of a hot body in space takes place by radiation, from the surface. So the surface would have cooled before the interior. Also, decay of radioactive elements would have helped to keep the interior of the Earth hot - a process that continues.

    The temperature difference led to convection within the Earth, which is the source of the motion that drives plate tectonics.

    Fractionation occurred, whereby the lighter minerals tended to float upward and the heavier ones to sink down towards the centre. This is how the Earth came to have a core that is rich in iron and nickel, while the mantle and surface rocks are rich in magnesium and aluminium, respectively.

    The solid "skin" that would have formed at the surface due to the faster cooling would have been dragged by the convective motion and would have cracked. The blocks thus formed would have been the first tectonic plates.



    Eventually,
    sculptor likes this.
    Reply With Quote  
     

  5. #4  
    Forum Radioactive Isotope sculptor's Avatar
    Join Date
    Apr 2012
    Posts
    4,211
    Quote Originally Posted by exchemist View Post
    Quote Originally Posted by Casmo82 View Post
    I don't really know how to explain this but how did the earth's crust form I guess. I know that the earth was a shitstorm of magma and lightning and the magma was cooled to form the tectonic plates but how would the plate be shaped, what would/could have cooled the magma, what would the terrain be like, and how would the have moved. Any help or hell even speculation would be much appreciated.
    Cooling of a hot body in space takes place by radiation, from the surface. So the surface would have cooled before the interior. Also, decay of radioactive elements would have helped to keep the interior of the Earth hot - a process that continues.

    The temperature difference led to convection within the Earth, which is the source of the motion that drives plate tectonics.

    Fractionation occurred, whereby the lighter minerals tended to float upward and the heavier ones to sink down towards the centre. This is how the Earth came to have a core that is rich in iron and nickel, while the mantle and surface rocks are rich in magnesium and aluminium, respectively.

    The solid "skin" that would have formed at the surface due to the faster cooling would have been dragged by the convective motion and would have cracked. The blocks thus formed would have been the first tectonic plates.



    Eventually,
    I would add that there are theories involving impacts of "cold" bodies which started plate tectonics, and added crustal materials.
    Reply With Quote  
     

  6. #5  
    New Member
    Join Date
    Jul 2013
    Location
    Somewhere between the pit of man's fear and the summit of his knowledge
    Posts
    3
    Thanks!
    Reply With Quote  
     

Similar Threads

  1. Replies: 17
    Last Post: October 17th, 2012, 06:20 PM
  2. The Origin and Evolution of Continental Crust
    By John Galt in forum Earth Sciences
    Replies: 45
    Last Post: August 12th, 2012, 06:36 PM
  3. Mountains and crust
    By termina in forum Earth Sciences
    Replies: 6
    Last Post: May 31st, 2010, 03:38 PM
  4. Reshaping the Crust
    By kingwinner in forum Earth Sciences
    Replies: 1
    Last Post: January 6th, 2006, 08:06 AM
  5. Replies: 1
    Last Post: November 19th, 2005, 06:55 PM
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
  •