Answer: Igneous rocks
Step-by-step explanation: The formation process of rocks occurs when hot molten rock cools and solidifies into crystals. This transformation is a natural occurrence that involves the cooling of the molten rock until it reaches a solid state, which leads to the formation of various types of rocks such as igneous rocks. The process is a complex one that involves the transformation of the hot molten rock into a solid and stable structure through a series of chemical reactions and physical changes.