Igneous Rocks Scripps Classroom Connection

Mafic Mafic – magma or igneous rock rich in magnesium (Mg) and iron (Fe) and generally dark Felsic Felsic - magma or igneous rock rich in feldspars and silica and generally light Partial Melting – process by which different minerals in rock melt at different temperatures Fractional Crystallization – reversed process of partial melting Scripps Classroom Connection Partial Melting

Bowen’s Reaction Series Scripps Classroom Connection

Intermediate Igneous Rocks Felsic Igneous Rocks Mafic Igneous Rocks Scripps Classroom Connection

Extrusive – an igneous rock formed at the Earth’s surface Intrusive – an igneous rock formed beneath Earth’s surface Scripps Classroom Connection

Scripps Classroom Connection

How to classify igneous rocks: Scripps Classroom Connection FelsicIntermediateMaficUltramafic Coarse GraniteDioriteGabbroPeridotite Fine RhyoliteAndesiteBasalt Vesicular PumiceScoria Glassy Obsidian* Light Dark Rock Color

Scripps Classroom Connection How are the different textures of igneous rocks formed? Animations

Scripps Classroom Connection

Scripps Classroom Connection Relation of Igneous Rocks to Plate Tectonic Boundaries Animations

Mid-ocean Ridges Scripps Classroom Connection

Overview  Igneous rock formation  Crystal size and other textures  Color  Igneous rock classification  Locations where igneous rocks form Scripps Classroom Connection