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Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 20% of Earth’s radius or 70% of the Moon 's radius.
The geographical centre of Earth is the geometric centre of all land surfaces on Earth. Geometrically defined it is the centroid of all land surfaces within the two dimensions of the Geoid surface which approximates the Earth's outer shape.
Oct 6, 1997 · The center of the earth lies 6,400 kilometers (4,000 miles) beneath our feet, but the deepest that it has ever been possible to drill to make direct measurements of temperature (or other...
Jun 11, 2024 · Earth’s core is the very hot, very dense center of our planet. The ball-shaped core lies beneath the cool, brittle crust and the mostly solid mantle . The core is found about 2,900 kilometers (1,802 miles) below Earth’s surface, and has a radius of about 3,485 kilometers (2,165 miles).
Jun 1, 2010 · The mantle makes up the majority of the interior of the Earth, and its composed of heated rock under high pressure. But inside the mantle is the core of the Earth, and it’s made of metal.
Oct 9, 2023 · The center of Earth lies around 4,000 miles under our feet — but what lies beneath the outer crust and the inner core?
Jun 11, 2007 · A new NASA study proposes a novel technique to pinpoint more precisely the location of Earth's center of mass and how it moves through space.
Earth's core: what lies at the centre and how do we know? - BBC Science Focus Magazine.
Mar 31, 2022 · Earth’s magnetic field, nearly as old as the planet itself, protects life from damaging space radiation. But 565 million years ago, the field was sputtering, dropping to 10% of today’s strength, according to a recent discovery.
Earth is composed of four main layers, starting with an inner core at the planet's center, enveloped by the outer core, mantle, and crust. The inner core is a solid sphere made of iron and nickel metals about 759 miles (1,221 kilometers) in radius.
