A metamorphic rock is a type of rock which has been changed by extreme heat and pressure. The original rock gets heated (temperatures greater than 150 to 200 °C) and pressured (1500 bars). This causes profound physical and/or chemical change.
igneous rock is made from cooled magma after a volcano erupts and cooled
Sedimentary rocks are types of rock that are formed by the deposition and subsequent cementation of mineral or organic particles on the floor of oceans or other bodies of water at the Earth's surface.