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The Earth's Structure, The Outer Core, The Mantle, The Crust - Coggle…

- - - - lighter aterial stayed nearer to the surface forming the mantle
        
        A think layer close to the surface cooled enough to become fully solid and that is known as the crust
- - - - it is 6,000 C
        
        it is solid due to intence pressure
        
        it is made up of 90% iron as well as a small amount of nickel and sulphur
- - - - it is made up of molten iron and nickel
- - - - the lower mantle is made up of molten magma. As the magma becomes hot, it rises upwards towards the surface. As it rises it cools and eventually sinks downwards again
        
        The heating and cooling of magma creates thermal convection currents
        
        convection currents are responsible for endogenic forces ( forces that cause movement on the earths surface)
      - The Asthenosphere is the name given to a 100-200 km thich section of the mantle that is made up of semi- molten rock
        
        As it is partially melted, the asthenosphere lefts solid rock above slide on it
      - the solid upper mantle: it sits on top of the asthenosphere. This solid part of the upper mantle and the crust combined is known as the lithosphere.
        
        although solid and rigid, the lithosphere is brittle and is broken into several sections called plates, these plates slide on tp of the Asthenosphere
        
        the boundary that divides the solid upper mantle and the crust is known as the Moho line
- - - - Continental crust can be as thin as 30km where there crust is being puller apart an as thick as 70km at mountain ranges