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Plate margins and plate tectonics
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This document contains notes on the topic of Plate margins and plate tectonics that will be useful when studying Geography in KS3 or GCSE. The information has been gathered and paraphrased from various articles, textbooks, and lectures.

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  • September 10, 2023
  • 4
  • 2023/2024
  • Interview
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Plate margins and plate tectonics
 There are 4 layers of the Earth - Crust, Mantle, Outer Core and Inner Core

Inner Core

o Located at the centre of the Earth.
o Hottest layer which has temperatures up to 5500 degrees Celsius
o Made up of iron and nickel

Outer Core

 Layer surrounding the inner core.

Mantle

 Liquid layer made up of nickel and iron.
 Thickest layer of the earth at approximately 2900 Km.
 Made up of semi - molten rock called magma.

Crust

 0-60 Km thick
 Thin layer is solid.
 Made of huge pieces of land called tectonic plates which fit together like a jigsaw
puzzle.
 Thin upper layer is crust (located above lithosphere), 5Km and 30 Km.
o lithosphere (located just below the crust) thickness, 50 Km and 200 Km.
o Lithosphere is brittle and is is prone to breakage.




There are 2 types of crust:
 In 1965, the term ‘plate tectonics’ was first used.
 The Earth’s surface was believed to be divided into 7 major and 8 minor lithospheric
plates
 Plates sit on top of the mantle (semi-molten rock). This makes it easier for the plates
to move easily.

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