* Igneous rocks form from cooled magma or lava. Magma originates deep within the Earth, and lava is magma that has erupted onto the surface. So while igneous rocks can be found at the surface, they originate below it.
* Sedimentary rocks are formed from the accumulation and cementation of sediments, which can come from eroded rock, plant and animal remains, and even volcanic ash. These sediments can originate both at the surface and within the Earth.
* Metamorphic rocks form when existing rocks (igneous, sedimentary, or even other metamorphic rocks) are transformed by heat and pressure. This transformation can happen deep within the Earth or at the surface.
Therefore, no single rock type always originates at the surface of the Earth.
