Here's why:
* Metamorphic rocks are formed when existing rocks (igneous, sedimentary, or even other metamorphic rocks) are transformed by intense heat and pressure.
* Igneous rocks are formed from the cooling and solidification of magma or lava.
So, while metamorphic rocks experience heat and pressure like igneous rocks, they don't originate from molten material. Instead, they are transformed from existing rocks due to these conditions.