Molten Core

Planetary core

A planetary core consists of the innermost layers of a planet. Cores may be entirely liquid, or a mixture of solid and liquid layers as is the case in the Earth. In the Solar System, core sizes range from about 20% to 85% of a planet's radius (Mercury).

Melting

Melting, or fusion, is a physical process that results in the phase transition of a substance from a solid to a liquid. This occurs when the internal energy of the solid increases, typically by the application of heat or pressure, which increases the substance's temperature to the melting point. At the melting point, the ordering of ions or molecules in the solid breaks down to a less ordered state, and the solid melts to become a liquid.

molten

Adjective

1. Melted, especially due to great heat
2. Made from a melted substance. (Can we add an example for this sense?)

Verb

1. past participle of melt

core

Noun

1. In general usage, an essential part of a thing surrounded by other essential things.
2. The central part of a fruit, containing the kernels or seeds.

Adjective

1. Forming the most important or essential part.
2. Deeply and authentically involved in the culture surrounding the sport.