The Earth’s core is cooling down very slowly over time. the Earth. The center of the Earth is probably one of the most mysterious places on our planet because we cannot physically go there. 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. Shape of the Earth › Inner core. There is a lot of information about the Earth’s core, and numerous scientific documentaries have been made surrounding the concept. 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. 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). 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. The metal at the inner core stays solid because of the incredible pressure surrounding it. The remainder is the Earth’s liquid outer core, made of mostly nickel-iron, with similar temperatures, getting hotter towards the centre. One day, when the core has completely cooled and become solid, it will have a huge impact on the whole planet. The source of this magnetic field is the core at the centre of our planet. This is the fourth, and hottest, layer of the Earth. Outer core Edit. 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. Earth 101 Earth is the only planet known to maintain life. The Earth is not totally round. Earth's magnetic field protects and makes our planet habitable by stopping harmful high-energy particles from space, including from the Sun. 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. At approximately 5,400°C, this inner core is similar in temperature to the surface of the Sun. The outer core of the Earth is a liquid layer about 2,260 kilometers thick. Find out the origins of our home planet and some of the key ingredients that help make this blue speck in … The Earth’s inner core is a huge metal ball, 2,500km wide. 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