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 The earth has four layers. The center of the earth, or core, is made of very hot metal, mostly iron and some nickel.
It has two layers. The outer core is liquid and the inner core is solid. The thick mantle comes next. It is made of rock--some of which has melted into magma. The rocky outer coating of the earth,
called the crust, rests on top of the mantle. The crust doesn't cover the earth like a skin on an orange. It is separated into huge plates that are constantly moving.
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