* Metamorphic rocks are formed when existing rocks (igneous, sedimentary, or even other metamorphic rocks) are subjected to intense heat and pressure deep within the Earth's crust. This process changes the rock's mineral composition and texture.

Let's look at the other options:

* Sedimentary rocks form from the accumulation and cementation of sediments (like sand, mud, or organic matter).

* Intrusive igneous rocks form when magma cools and solidifies beneath the Earth's surface.

* Extrusive igneous rocks form when lava (magma that reaches the surface) cools and solidifies.

Let me know if you have any other questions!