Igneous rock - Wikipedia
Igneous rock (derived from the Latin word ignis meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic.Igneous rock is formed through the cooling and solidification of magma or lava.. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust.Typically, the melting is caused by one or more of ...