What are the 3 types of rock? Objective Students will be able to identify and list characteristics of igneous, sedimentary and metamorphic rocks Students will be able to describe how each rock is formed Background Brief overview of the three types of rocks: -Metamorphic Rocks - form when a sedimentary, igneous or metamorphic rock is exposed to heat and pressure (under the surface of the Earth) - think metamorphosis, these rocks were changed -Igneous Rocks - form from magma or lava (melted rocks) that cools on the surface of the Earth (extrusive igneous) or underground (intrusive igneous) - thi Duration: 90 Minutes.