Britannica
Sources used in this answer
- Earth - The interior of Earth
- earthquake - Structure of the Earth’s interior
- chemical element - The Earth’s core
- plate tectonics - Earth’s layers
- high-pressure phenomena - Effects on electric and magnetic properties
- nickel–iron
- meteorite - Matrix
- earthquake - Seismological tomography
- dipolar hypothesis
- nickel-iron
- geomagnetic field - The geomagnetic dynamo
What role does iron play in the composition of the Earth's core?
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iron
Properties of iron.
Iron is a primary component of Earth's core, making up between 85 and 90 percent of its mass. The core is largely composed of a liquid iron alloy, mixed with nickel and smaller amounts of lighter elements like sulfur and oxygen. A solid inner core also exists, primarily made of iron. This metallic composition is inferred from seismic wave data and the understanding that iron is a siderophile element, meaning it readily alloys with iron and concentrates in the core. The core's iron content is crucial for generating Earth's magnetic field through the dynamo effect.1234