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Friday 17 June 2011

layers of the earth


W.A.L.T-make a model of the layers of the earth out of play-dough

So that when we learn about natural disaster we can use our knowledge of the layers to understand them better and to help us in topic and science and learn about the earth around us!

The outside of the earth is called the crust made by a jigsaw of tectonic plates. The crust(or tectonic plates)contain the continents ,the seas and the earth. Did you know that the thickness of the crust is 15 to 75 km and it keeps the world together?

The second and the third part of the earth is called the upper mantle and the lower mantle. The upper mantle contains,iron,magnesium and sulphur. Did you know that the thickness of the upper mantle is 400 km?

The lower mantle is more dense than the upper mantle and did you know that the thickness of the lower mantle is 2300 km?

The fourth part of the earth is called the outer core.The outer core contains liquid,iron,nickel and sulphur and did you know that the thickness is 2300?

The inner core is solid and it contains iron,nickel, and sulphur. The temperature is 6650 degrees Celsius. Did you know the inner core is hottest the world?

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