Please enable JavaScript.

Coggle requires JavaScript to display documents.

Hazards (seismic hazards (features (focus- where the energy is released,…

- - - - heat energy transferred from the core, semi molten magma is heated it becomes less dense and rises, as the magma rises to the surface, it cools and becomes more dense, spreads and sinks. the magma travels in a circular motion.
      - ridge push
        
        at conservative boundaries where oceanic plates are pulled apart by convection currents magma rises to plug the gap. this forms a crust above the sea level of the ocean floor. the lithosphere and asthenosphere closest to the ridge are heated by the rising magma and expands creating a slope down to the cooler lithosphere further away from the ridge. the newly formed crust and lithosphere slide downward due to gravity away from the ridge and is replaced by new molten. this is called ridge push.
      - slab pull
        
        destructive boundaries where oceanic collide with lighter less dense continental plates the denser crust subducts. the leading edge of the subducting plate is colder and heavier than the upper mantle and the asthenosphere so it exerts great force on the rest of the plate behind it. the rest of the plate is pulled down with it .
    - - continents were once joined together in one super continent called pangea. split into 2 continents called Laurasia and Gondwanaland.
    - - all continents fit together
    - - they found fossils on the other side of the ocean. scientist believe it is impossible that evolution in two separate areas could have made the same species. they also believe it impossible to fly or swim in the salt water. mesosaurus found only in south america and southern africa.
      - climatological evidence coal found in Antarctica, USA, UK and Australia of similar ages suggest they were once tropical climate zones