The earths surface

The earths surface

1. Structure

   • Crust
     • I) Is the outside layer
       • II) is made of solid rock
   • Mantle
     • I) Lies under the crust
     • II) is made of molten or semi molten rock
       • Called Magma
     • III) The magma is moved around by currents
   • Core
     • I) The centre of the earth
     • II) is made of iron and nickel
     • III) Hottest part of the eart
       • At 6000 degrees
     • IV) Can be divided into inner and outer core

2. Plates

   • Continental plates
     • Are plates with land on top
   • Oceanic plates
     • Are plates with oceans on top
   • Sit on top of mantle
     • Magma in mantle is moved around In a circular motion by convention currents
       • This causes plates to move, plates can -
         • I) Collide
         • II) separate
           • At plate boundaries
         • III) Slide

3. Crust is broken into

   • Plates
     • A plate boundary is where to plates meet

4. Convection currents

   • I) When magma is heated in the mantle, it rises towards the crust
     • II) As it rises it cools and moves upwards causing friction between the magma and crust and pulls the plates
     • III) The magma cools and sinks back down to the mantle
       • IV) This process is constantly repeated