Here's the breakdown:

* Rocks are naturally occurring solid materials made up of one or more minerals.

* Metamorphic rocks are rocks that have been transformed from their original form (igneous, sedimentary, or even another metamorphic rock) due to intense heat and pressure.

Think of it like this:

* Igneous rocks are like fresh dough, formed from molten rock.

* Sedimentary rocks are like the dough after it's been pressed and baked into a loaf.

* Metamorphic rocks are like the loaf after it's been put back in the oven, changing its texture and appearance.

So, while all rocks can change over time, the term you're looking for is metamorphic rock to specifically describe rocks that have been transformed by heat and pressure.