Restless Earth intro
- Created by: Freya Woolley
- Created on: 10-05-15 18:15
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- Restless Earth Intro
- Structure of the earth
- Crust
- Outer layer- thin slit into plates
- Between 5-60km thick, cont. thicker
- Oceanic- denser, below water
- Continental- less dense, made from granite
- Mantel
- Dense, mosty solid layer between the outer core and crust. Properties of solid but can flow slowly
- 80% of earths volume, 2900km thick
- CAn reach 3800c
- Core
- Made from liquid and nickel and iron, centre of earth very hot- 4300c
- Innercore- solid, outercore- liquid
- Radius is half of the earths radius
- Crust
- Why do plates move?
- Heat from core melts rock
- Melted rock expands, its density is reduced and rises (convection)
- Rising liquid will cool, contract and sink
- If liquid reaches the surface it causes plates to move
- Convection currents- movement of a liquid due to a change in tep.
- If liquid reaches the surface it causes plates to move
- Rising liquid will cool, contract and sink
- Melted rock expands, its density is reduced and rises (convection)
- Heat from core melts rock
- Oceanic vs continental
- Oceanic
- Newer- less than 200 mill years old
- 5-10km -thinner
- Basalt- can sink
- Can be renewed or destroyed
- Continental
- Older- over 1500 mill yrs
- 20-65km- thicker
- Granite- less dense, cannot sink
- Cannot be renewed or destroyed
- Oceanic
- Plate margins
- Destructive- converging (towards)
- Subduction and collision
- Collision - continental and continental
- Resists subducts, buckles up to create mountains
- Collision - continental and continental
- Continental and oceanic
- Subduction and collision
- Constructive- diverging (apart)
- Oceanic and oceanic
- Gap forms magma rises
- Conservative-sideways
- Oceanic and continental
- Stuck- different speed and angles, causes friction
- Pressure builds, when released- shock waves
- Destructive- converging (towards)
- Structure of the earth
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