The element primarily found in the Earth's core is iron. The Earth’s core is composed mainly of an inner solid core and an outer liquid core, both consisting predominantly of iron, along with nickel and other elements. This metallic core plays a crucial role in generating the Earth's magnetic field through the dynamo effect, resulting from the movement of molten iron in the outer core. Understanding the composition of the core is essential for insights into the planet's geology, magnetic properties, and heat dynamics.