What type of rock is formed by intense heat and pressure?

Metamorphic rock is formed under conditions of intense heat and pressure that alter the mineral composition and texture of existing rock types, which can be igneous, sedimentary, or other metamorphic rocks. The process that leads to the formation of metamorphic rocks is known as metamorphism. This transformation can cause changes such as the recrystallization of minerals, foliation (alignment of mineral grains), and the development of new minerals that are stable under the new temperature and pressure conditions.

In contrast, igneous rocks are formed from the cooling and solidification of molten rock material (magma or lava), not through heat and pressure acting on existing rocks. Sedimentary rocks are created from the accumulation of sediment that has consolidated over time, and fossilized rocks refer specifically to sedimentary rocks that contain fossils, which also results from different processes compared to the formation of metamorphic rocks. Thus, the defining features and formation processes of metamorphic rocks make this answer accurate.