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Tectonic Activity Unit 1. Which one are we like?. Structure of the earth. Structure of the earth. The Core Temperatures about 6000  C but due to huge pressure solid (hotter than the surface of the sun) Mantle

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Structure of the earth7 l.jpg
Structure of the earth

The Core

Temperatures about 6000C but due to huge pressure solid (hotter than the surface of the sun)


Consists of melted rocks. Temperatures around 3500C. The mantle tends to creep and flow like a ‘toffee’ like mixture.


A thin layer on the outside of the earth. The crust is broken into smaller pieces, these pieces are known as plates. Plates float on the mantle and can move around.


A huge section of the earths crust that floats on the mantle

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There are two types of plate

Oceanic plates (sea crust)

A thin layer between 6-10Km

Dense (or heavy)

Young rock (basalt)

Continental Plates (land crust)

Thicker, between 20-70km (thickest under mountains

Light ( not as heavy)

Old rock (granite)

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Why do plates move?

Any Ideas?

Use Complete Geography p6+7 and this link to help you draw and explain why plates move


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Test Yourself

  • Answer the questions on p7 of Complete Geography

  • http://www.bbc.co.uk/schools/gcsebitesize/geography/platetectonics/