Hard core (Core) is a world leading in most parts of the world where the density, which is composed of iron and nickel alloys during. Can be divided into 2 floors, is organising the world leading (outer core), which has a density greater than typical rock-5 times the heat as high as 4,000 degrees Celsius. Naughty world class (inner core) is in the heart of the world fit. There was tremendous pressure. This section has a solid state, composed of iron and nickel, which are in solid condition.
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