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Geologist discovered that the Earth is made up of different layers by studying seismic waves. They concluded that the Earth is made up of three distinct layers, which are the crust, mantle, and core

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The first layer is the crust. This is where we live. It is the thinnest layer, only about 5 kilometers under the oceans, and about 30 kilometers.
Between the crust and the mantle, there is a cross section, which is called the lithosphere and athenosphere. The lithosphere is made up of the very slowly moving tectonic plates. The asthenosphere is where the plates move. This layer is somewhat liquid.

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The next layer is the mantle. It is about 2,900 kilometers thick. The mantle can also be split into two sections, called the upper and lower mantle.

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Made up of mostly iron and nickel, the outer core is the only liquid layer of the Earth. It is about 2,300 kilometers thick.

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The inner core is also made up of iron and nickel, but in solid form instead of liquid form. It is the very center of the Earth and about 1,200 kilometers in diameter.