What causes seafloor spreading?

7 Answers

  • 2 months ago

    The Earth is getting bigger... means you are getting smaller...  

  • 2 months ago

    Convection and conduction of heat from the core and through the mantle is what causes oceanic and continent rifts to form. The Great Rift Valley is a co rental purist that will become a n8ew sea and ocean. 

  • ?
    Lv 7
    2 months ago

    Teutonic plate movement

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  • 2 months ago

    The thinking is that there is mantle upwelling, movement of mass upward through the mantle because of heating at depth and response to density changes with heating. (mantle convection).  The spreading centers correspond to zones of important upwelling of mass and heat.  The material forces itself into the space and forces spreading.

    Of course, there must be more than just a simple shoving a wedge into the crust to pry it apart, or we would see the crust nearby crumpling to make room for the split, which it does not do (it mostly only does that where two plates collide). there has to be sidewards (lateral) movement of the upper mantle away from the spreading centers as part of the mantle convection, and this sidewards push drags the overlying crust with it.

    So, it is a bit of both pushing (wedging) in and pulling apart from the sides, at the same time.  We see this sort of thing happening with ice on top of water, like lakes in the winter, and even in the oceans in some places.  Basically the same process, but with different materials.

  • 2 months ago

    Overeating and not enough exercise.

  • 2 months ago

    Underwater volcanoes

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