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Thursday, 16 June 2011

Layers of the Earth

We were learning to make a model of the layers of the earth out of play-dough.

So...that when we learn about natural disasters we can use our knowledge of the layers to understand them better

To... help us in topic and science and learn about the world around us.

Did you know, the crust is made out of 7 tectonic plates which contains continents and seas of the earth?  The crust is 15-75 km thick.

The mantle is made up by the upper mantle and the lower mantle.  The upper mantle is 400km thick and contains iron and magnesium silicates.  The lower mantle is 2300km thick and is more dense than the upper mantle.

The outer core is 2300 km thick.  It contains iron, nickel and sulphur and is made up from liquid.

The inner core is 1220 km thick and is solid.  It contains iron, nickel and sulphur.  The temperature can reach up to 6650 degrees celcius!

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