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Old 9th June 2009, 05:12 PM   #1 (permalink)
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Geography A-level: Natural Hazards

Source:http://www.s-cool.co.uk/alevel/geogr...structure.html

The core, the mantle and the crust

Before starting work on this topic it is vital that you know the structure of the earth, as it underpins a majority of the work related to natural hazards. The diagram below summarises the most important points:

Place the cursor over the various sections of the earth to see what they are called:


Crust

Thin, outer-layer of the earth.
It is as thin as the skin of an apple is to its flesh.
Mantle

Composed mainly of silicate rocks, which contain a lot of magnesium and iron.
It extends to a depth of 2900km.
Temperatures can reach 5000 degrees Celsius, which generate convection currents.
Core

Contains iron and nickel.
Situated approximately 6371km below the surface.
Temperature is around 5500 degrees Celsius.

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Old 26th June 2009, 10:07 PM   #2 (permalink)
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Re: Geography A-level: Natural Hazards

hey thanks this was of help.

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