Which type of rock forms when an existing rock changes under extreme pressure and intense heat?

Hornfels is a metamorphic rock that can form when a rock is subjected to high temperatures. Hornfels, which often forms when magma or lava touches other rock, is nonfoliated ... Heat and pressure changes both igneous rocks sedimentary rocks into metamorphic rocks

Hornfels is a metamorphic rock that can form when a rock is subjected to high temperatures. Hornfels, which often forms when magma or lava touches other rock, is nonfoliated ... Heat and pressure changes both igneous rocks sedimentary rocks into metamorphic rocks.