| What are the 4 layers of Earth? | -Crust
-Mantle
-Outer Core
-Inner Core |
| Describe the Inner Core | Its located in the centre of Earth
Its the hottest part of Earth [5500 degrees Centegrade]
Its solid, made of iron and nickel |
| Describe the Outer Core | Located surrounding the Inner Core
It is a Liquid, but made of Iron and Nickel. |
| Describe the Mantle | Thickest section of Earth [2900km]
Made of Magma [semi molten rock] |
| Describe the Crust | Outer layer of Earth
Thin [60km]
This is what we stand and build on
Can be split to Oceanic or Continental Plates
Is broken in parts [Plates] |
| Do Convection Currents move plates around? | Yes they do
How it works is the Convection current [movement inside the Mantle due to the heat of the core] in the Mantle has slowly moved the crust around |
| What is Slab Pull? | This is an idea that also connects with Convection Currents
How this one works is that older, denser tectonic plates sink into the mantle at subduction zones. When they sink, newer and less dense sections are pulled along behind.
This 'sinking' can cause plates to move apart in some places |
| What is these ideas of the plates moving called? | The Theory of Plate Tectonics |
| What is Oceanic crust? | This type of crust is found underneath oceans. It is denser then Continental crust which means it can be Subducted |
| What is Continental crust? | This type of crust is found under land masses or even continents. It is older then oceanic crust and is less often destroyed. |
| Where can Earthquakes happen? | They can happen in every plate boundry |
| Where can Volcanoes happen? | They can only happen in Construction and Destructive [Subduct] plate boundaries. |
| What is a Destructive Plate Margin? | This is when a Oceanic plate collides with a Continental plate. The Oceanic plate is forced under the Continental plate as because its heavier. It Subducts. As the plate sinks into the mantle or Lithosphere, it melts to become magma. This newly formed magma, along with the other magma in the mantle builds pressure below the Crust. It then escapes by going through the weakness in the rock and becomes a Composite Volcano. |
| What is a Collison plate margin? | This is when two Continental plate margins collide. None of them sink, but they buckle upwards to make Fold Mountains, Like Mount Everest. Volcanoes cant happen here as there is no opening or additional pressure |
| What is a Constructive plate marigin? | This is when two plates move away from each other. When this happens, the magma from the Mantle rises to make new crust or a Shield Volcano. Earthquakes happen to, as the magma rising can release the pressure of rocks holding together. |
| What is a Conservative Plate margin? | This is when two plates move side by side in different speeds. As they move, friction can build up until the friction created stops the plate. The pressure builds up as the plates want to move, until it isn't, which creates an earthquake. These Earthquakes are deadly.
No volcanoes can happen here, as there isn't a opening. |
