The Rock Cycle:
The Rock Cycle is a group of changes. Also, igneous rocks can change into sedimentary rock or into metamorphic rocks. Sedimentary rocks can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. However, igneous rock forms when magma cools and makes crystals. Magma is a hot liquid made of melted minerals. On the other hand the minerals can form crystals when they cool. Igneous rocks can form underground, where the magma cools slowly. Or, igneous rock can form above ground, where the magma cools quickly. Also, the rock cycle keeps on going and going.