Sediment - Rocks at Earth's surface are broken down into smaller pieces called sediments. -> Sedimentary Rock - When sediments are compacted and cemented sedimentary roack form -> Metamorphic Rock - Any type of rock that is changed by heat, pressure, or fluids becomes a metamorphic rock. -> Magma-Magma forms when rock melts deep beneath Earth's surface -> Igneous Rock - When magma or lava cools and solidifies, igneous rocks form. -> Sediment