Much of the Rock Around the Earth's Core Is This

This page is the CodyCross answer for the clue below from Apothecary, Group 1973, Puzzle 4 (Curative Agents).

Question is: Much of the Rock Around the Earth's Core Is This

and the answer is: MOLTEN

Word Meaning:

MOLTEN — Melted, especially due to great heat

Definitions from Wiktionary.