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8483785
Tectonics 1
Descrição
AS level Geography Mapa Mental sobre Tectonics 1, criado por Dana Davies em 08-04-2017.
Sem etiquetas
techtonics
ridge push
slab pull
structure of the earth
pangaea
geography
as level
Mapa Mental por
Dana Davies
, atualizado more than 1 year ago
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Criado por
Dana Davies
mais de 7 anos atrás
7
0
0
Resumo de Recurso
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
which split into Gondwanaland and Laurasia
Composition of the Earth
Crust
Oceanic
heavier, denser, younger, non-permanent
e.g Basalt
Continental
older, lighter, permanent
e.g Granite
Mantle
Nickel and Iron
3,000km
1,000 degrees
Outer Core
Nickel and Iron
Liquid = heat
Inner Core
Nickel and Iron
Solid = pressure
Convection currents
1000 degrees + mantle rocks are heated
Rise up to cool surface
They cool, go sideways and back down
Ridge push
Plates at spreading centres
Hot material spews through gaps
ridge formation
as gravity pulls it down so more material flows out
elevated temp lowes density so it rises in the mantle
Slab Pull
Plates at subduction zones
lower temp makes plate denser than mantle
the crust is pulled (subducted) into the mantle
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