1 Igneous Rocks Igneous Rocks Definition of Igneous Rocks Definition of Igneous Rocks • Igneous rocks form from cooling and Igneous rocks form from cooling and crystallization of molten rock crystallization of molten rock- magma magma – Magma Magma – molten rock within the Earth molten rock within the Earth – Lava Lava – molten rock on the Earth molten rock on the Earth’ s surface s surface • Igneous rocks form the framework for the Igneous rocks form the framework for the earth earth’ s crust s crust