Continental drift, sea floor spreading and plate tectonics

  • Created by: SIM456c
  • Created on: 29-12-16 17:33
Convection currents
Currents in the mantle causes plates to be 'rolled' across the surface
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Ridge push
New matter formed at the Mid ocean ridge caused the plate to be pushed away from the MOR
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Slab pull
Subduction at destructive boundaries causes the plate to
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Rheid
Behaves like a plastic
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Plate Boundary types
Destructive, collision, - (Converging), Constructive (diverging), Conservative.
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Ocean trench
Very deep (11km), narrow, ~250km long,located at the edge of oceans - near fold mountains.
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Seamount
Submarine volcane with a height of 1km+ above the sea floor. Can be found independently, in a group or in a chain (arc)
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Abyssal plain
deep sea ocean basin, 3 - 5 km deep composed of mafic, oceanic rocks with fine sediments compacted on top
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Mid Ocean Ridge (MOR)
Formed at a constructive plate boundary (e.g Atlantic ridge) as the plates moved apart from eachother, magma rised up from the mantle and cooled to either side of the plates in 'pillows'
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Continental slope
The continental slope is the margin between the continent and the boundary between an oceanic plate. It is steep (~40 degrees) and is the section that rebounds to cause tsunamis.
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Continental Shelf
A Section of continental plate found underwater which once joined with other continents. The shelf gradually declines until it meets the slope
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Oceanic crust
0-10km thick, average density of 2.99g/cm3, made of mafic materials such as bassalt, relatively younger rock at 200ma
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Continental crust
0-75km thick, average density of 2.7g/cm3, made of felsic minerals such as quartz, feldspar and aluminium, relatively older upto 4000ma
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Other cards in this set

Card 2

Front

New matter formed at the Mid ocean ridge caused the plate to be pushed away from the MOR

Back

Ridge push

Card 3

Front

Subduction at destructive boundaries causes the plate to

Back

Preview of the back of card 3

Card 4

Front

Behaves like a plastic

Back

Preview of the back of card 4

Card 5

Front

Destructive, collision, - (Converging), Constructive (diverging), Conservative.

Back

Preview of the back of card 5
View more cards

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