The planetary core is the innermost layer of a planet, typically composed of dense materials, primarily metals like iron and nickel, though it can also contain lighter elements such as sulfur and oxygen. The structure and composition of a planetary core vary among different celestial bodies, but they generally play a crucial role in a planet's geology and magnetic field generation. ### Key Characteristics: 1. **Composition**: The core is usually made of heavy metals, and in some cases, may include lighter materials.
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