Igneous; they form from the cooling of magma deep inside the earth. Metamorphic; they are formed through the change (Metamorphosis) of igneous and sedimentary rocks. They can form both underground and at the surface.
The answer is igneous because igneous rocks become formed when magma cools and make crystals. Magma is a very hot liquid made from melted minerals. When the magma cools, they can make crystals.
