Please enable JavaScript.

Coggle requires JavaScript to display documents.

plate tectonics - Coggle Diagram

- - - - less dense, expand and rises and spread beneath the plates
        
        rising convection currents spread beneath the plates, dragging them apart, causing divergent plate movement
        
        The hot mantle material loses heat and sinks, pulling the plates along
        
        Point where magma sinks is the convergent boundary where sinking magma causes crust to move towards each other
  - - - gravity pulls the rest of the plate along into the mantle, contributing to further convergence
- - - - how it supports
        
        younger rocks are closer to the mid-ocean ridge and the age of the rocks get progressively older away from the ridge
        
        when new oceanic crust is formed, not enough time for sedimentation to accumulate
        
        oldest oceanic crust gets destroyed at oceanic trench while older crust have lots of sedimentation
  - - - when iron-rich lava erupts from the centre of the mid-ocean ridge ,cools and solidifies
        
        the magnetic field of the minerals in the lava will point towards the magnetic north at the point of solidification
        
        during a period of reverse polarity, the magnetic field of the minerals will point towards the reversed magnetic north