What's in the center of the earth?

But inside the mantle is the core of the Earth, and it's made of metal. The Earth's core is broken up into two distinct regions. The inner core is a sphere of solid metal that measures about 2,440 km across. It's believed to be comprised of 80% iron and 20% nickel. read more

Most of the Earth's mass must be located towards the centre of the planet . We can estimate Earth's mass by observing the effect of the planet's gravity on objects at the surface. It turns out that the mass of the Earth is 5.9 sextillion tonnes: that's 59 followed by 20 zeroes. There's no sign of anything that massive at the surface. read more

The center of the Earth is called its inner core, which is solid and surrounded by the liquid outer core. The outer core is surrounded by the solid mantle layer, which moves in response to a temperature difference of at least 2,700 degrees Fahrenheit between it and the inner core. read more

The geographical centre of Earth is the geometric centre of all land surfaces on Earth. In a more strict definition, it is the superficial barycenter of the mass distribution produced by treating each continent or island as a region of a thin shell of uniform density and approximating the geoid with a sphere. read more