8483785
Description
Mind Map by Dana Davies, updated more than 1 year ago
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Created by Dana Davies
over 7 years ago
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Tectonics 1
- 1912: Alfred Wegener proposed Pangaea (continental drift)
- geological, climatological and biological evidence
- Africa and South America fit together
- similar fossil remains on each continent
- coal reserves in antartica
- Africa and South America fit together
- which split into Gondwanaland and Laurasia
- geological, climatological and biological evidence
- Composition of the Earth
- Crust
- Oceanic
- heavier, denser, younger, non-permanent
- e.g Basalt
- e.g Basalt
- heavier, denser, younger, non-permanent
- Continental
- older, lighter, permanent
- e.g Granite
- e.g Granite
- older, lighter, permanent
- Oceanic
- Mantle
- Nickel and Iron
- 3,000km
- 1,000 degrees
- Nickel and Iron
- Outer Core
- Nickel and Iron
- Liquid = heat
- Nickel and Iron
- Inner Core
- Nickel and Iron
- Solid = pressure
- Nickel and Iron
- Crust
- Convection currents
- 1000 degrees + mantle rocks are heated
- Rise up to cool surface
- They cool, go sideways and back down
- They cool, go sideways and back down
- Rise up to cool surface
- Ridge push
- Plates at spreading centres
- Hot material spews through gaps
- ridge formation
- as gravity pulls it down so more material flows out
- as gravity pulls it down so more material flows out
- elevated temp lowes density so it rises in the mantle
- ridge formation
- Hot material spews through gaps
- Plates at spreading centres
- Slab Pull
- Plates at subduction zones
- lower temp makes plate denser than mantle
- the crust is pulled (subducted) into the mantle
- the crust is pulled (subducted) into the mantle
- lower temp makes plate denser than mantle
- Plates at subduction zones
- 1000 degrees + mantle rocks are heated
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