The outer core goes from a depth of 2550 km, down to 4750 km, and the inner core continues to the center of the Earth at a total depth of 6470 km. One day, when the core has completely cooled and become solid, it will have a huge impact on the whole planet. Shape of the Earth › Inner core. The outer core of the Earth is a liquid layer about 2,260 kilometers thick. The Earth is not totally round. There is a lot of information about the Earth’s core, and numerous scientific documentaries have been made surrounding the concept. The center of the Earth is probably one of the most mysterious places on our planet because we cannot physically go there. Earth's magnetic field protects and makes our planet habitable by stopping harmful high-energy particles from space, including from the Sun. The source of this magnetic field is the core at the centre of our planet. Earth's core is the deepest, hottest layer, and it's made up of two layers itself: the outer core which borders the mantle and the inner core, which is a ball-shaped layer made almost entirely of metal. Outer core Edit. Made mainly of iron, the temperature of the ball is 5,000°C to 6,000°C – that’s up to 6,000 times hotter than our atmosphere and scorching enough to make metal melt! The remainder is the Earth’s liquid outer core, made of mostly nickel-iron, with similar temperatures, getting hotter towards the centre. The Earth's core was previously estimated to be between 1.3 to 4.5 billion years old, with one recent estimate putting it even lower at 565 million years, according to the researchers. This is the fourth, and hottest, layer of the Earth. The Earth’s inner core is a huge metal ball, 2,500km wide. At the core’s heart is an extremely hot but still solid nickel-iron sphere with a radius of around 1,200km. The earth's core is divided into two separate regions: the liquid outer core and the solid inner core, with the transition between the two lying at a depth of 5,156 kilometers (3,204 miles). The transition between the inner core and outer core is approximately 5,000 km (3,100 mi) beneath the Earth's surface. It is made of iron and nickel.This is above the Earth's solid inner core and below the mantle.Its outer boundary is 2,890 km (1,800 mi) beneath the Earth's surface. At approximately 5,400°C, this inner core is similar in temperature to the surface of the Sun. The effect that gravity, an invisible force, has on the equator (an imaginary line around Earth’s middle) causes Earth to bulge outward, stopping it from being a perfect sphere. The Earth’s core is cooling down very slowly over time. Earth 101 Earth is the only planet known to maintain life. The metal at the inner core stays solid because of the incredible pressure surrounding it. 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