Extrusive Igneous Rock

Extrusive Igneous Rock

Extrusive igneous rocks forms when Lava, which is Magma that has risen to the surface of the Earth through a volcano, cools and solidifies. The rocks formed are smooth and noncrystalline. Basalt, shown here, is an Extrusive Igneous Rock that is formed when Magma erupts to the surface of the Earth as Lava. [LM] {CC}