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There are actually four layers.

The crust is the outermost layer of the earth, made of soil and bedrock, containing 60.6 percent silicon dioxide, 15.9 percent dialuminum trioxide, and other minor minerals. The mantel is directly beneath the crust, and is about 1,800 miles deep, containing 85 percent of the earth's weight and mass, and is molten rock. The outer core is next, about 1,200 miles deep, going down to about 3,000 miles. It is believed to be made of super-heated lave made of iron and nickel. Even deeper is the inner core, which is about 900 miles deep, and is a solid ball of super-heated iron and nickel. It is not molted because there is too much pressure on it, therefore stopping it from expanding and melting.

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Q: What are the features of each of the three compositional layers of Earth?
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