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GUIDED NOTES – IGNEOUS ROCKS Name _____________________ Date _________________ A. Origin of Igneous Rocks • _________________________ – Igneous rock formed from__________ that erupted onto the Earth’s surface. (exterior – exit) – Mineral _____________ are ______________ or ______ crystals are formed – Examples: Basalt, Obsidian (volcanic glass) • ______________________ – Igneous rock that formed when ___________________________ beneath the Earth’s surface. (interior – inside) – Mineral_________________ that form are __________________ – Example: Granite EXTRUSIVE ROCKS FORM IN TWO WAYS 1. _____________________: erupt and shoot out lava and ash. 2. _____________________: (FIH shurz), large cracks in Earth’s crust, can open up. B. Texture of Igneous Rocks – How do they feel? Depends on the _______________ and ____________ of the crystals Large crystals – _________________-grained texture (rougher feel) COOLED _________________ Small crystals – _______________-grained texture (smoother feel) COOLED _________________ C. Mineral Composition of Igneous Rocks • Magma _________ in silica usually forms ____________________________________. • Magma __________ in silica usually forms ____________________________________. D. Uses of Igneous Rocks • Tools and_____________________________ materials – Hard, dense and durable • Ancient Egyptians used _____________________ to build statues. • Headstones • Basalt is crushed to make _______________________. – The Vietnam memorial is made of black granite ( an igneous rock). ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++