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Summary Plate Tectonics + Natural Hazards - Notes Geography AQA GCSE Revision £6.49   Add to cart
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Summary Plate Tectonics + Natural Hazards - Notes Geography AQA GCSE Revision
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This resource outlines all knowledge required relating plate tectonics and natural hazards required for the AQA Geography Specification. This revision resource contains over 2,000 words meticulously hand crafted in order to achieve grade level 9. This resource explains and outlines in great d...

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  • May 25, 2021
  • 10
  • 2020/2021
  • Summary

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Geography Revision: Plate Tectonics and Natural Hazards


The Structure of the Earth:

o The earth is made up of four main layers. The outer layer is called the crust which is
broken into pieces called tectonic plates.

o The main land masses are called continental crust which is around 35km thick. The
ocean floor is mean up of much thinner and denser than continental. The oceanic
crust is covered by thin layer of ocean sediment.

o The earth’s crust is thickest under mountains where it can be up to 75km thick.

o Beneath the crust is the mantel which has an avg temperature of 1600 degrees
Celsius.

o The upper part of the mantle is around 600-800 degrees Celsius but it is still hot
enough for semi molten or plastic rock. The crust floats on this.

o The magma which feeds volcanoes come from melting oceanic crust at the sides
beneath the continental plate and down into the mantel.

, The earth’s tectonic plates:

The earth’s crust is divided into eight main and several minor plates. These plates fit
together like a jigsaw but move in constant motion relative to each other.




Convection Currents:

o Due to the intense heat at the core {up to 5000 degrees C}, this creates convection
currents as the semi-molten magma in the mantle sinks, the hotter from the centre
rises.

o This creates a rotating convection which are extremely powerful and move the
tectonic plates that float on the surface.

o The plate movement is very slow e.g. The North American plates are moving apart at
around 9cm per year along the mid-atlantic ridge

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