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What’s inside the earth? Create a craft or bake a cake that will help you dig deep into the mysteries of the earth’s interior.First, it’s time for a short geology lesson. The earth has four layers. The top layer is the one we live on, and it’s called the crust. The crust is like the crunchy outside of a loaf of bread, except that your bread probably doesn’t have trees living on it. The crust is made out of lighter rocks such as granite. All of the rocks, streams, mountains, and beaches where we see rocks are all part of the crust. The crust is fairly small when it’s compared to the other layers of the earth. It’s only 3 to 5 miles deep under the oceans and about 25 miles deep on land. The earth’s crust is not a smooth coating on the earth, but it’s made out of plates that move around. When the plates move against each other, it causes earthquakes.The second layer of the earth is just below the crust. It’s called the mantle. The mantle is very thick: 1800 miles deep. The mantle is a little bit like a sandwich. On the top and bottom parts of the mantle, the rock doesn’t move very much. In the middle of the mantle is the asthenosphere. This part of the mantle moves around fairly slowly. This moving mantle layer pushes the earth’s plates around.Next is the core of the earth. The outer core is very hot. It can be up to 9000 degrees F! Inside the outer core, metals such as iron and nickel move around as liquids.

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Fecha publicación: 12.5.2016

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