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Chapter 6, Section 2

Chapter 6, Section 2. Key Terms. Create a flash card for the following key terms (p. 129 in textbook): Igneous Rock Intrusive Igneous Rock Extrusive Igneous Rock Felsic Mafic If you finish early, study your flash cards!. Igneous Rock.

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Chapter 6, Section 2

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  1. Chapter 6, Section 2

  2. Key Terms Create a flash card for the following key terms (p. 129 in textbook): • Igneous Rock • Intrusive Igneous Rock • Extrusive Igneous Rock • Felsic • Mafic If you finish early, study your flash cards!

  3. Igneous Rock • Most Igneous Rock (formed from cooled magma) is crystalline (made of crystals). • Magma forms when rocks melt. • 3 Factors determine when rock melts: temperature, pressure, and pressure of fluids in the rock.

  4. Igneous Rock Video Clip

  5. Partial Melting • Different minerals have different melting points. • Minerals with lower melting points, melt first. • The process of different minerals in the rock melting at different temperatures is called PARTIAL MELTING.

  6. Fractional Crystallization • When magma cools, the opposite of partial melting occurs: freezing. • Different minerals have different freezing points. • As some minerals freeze, the composition of the remaining magma changes, creating new minerals. • This is called fractional crystallization.

  7. Fractional Crystallization • Crystals that freeze/form early tend to be the largest.

  8. Types of Igneous Rock

  9. INTERACTIVE! • Create and Acrostic Poem using the word IGNEOUS. • I • G • N • E • O • U • S

  10. Textures of Igneous Rocks

  11. Textures Video Clip

  12. Quick Check!! • Name the 2 types of Igneous Rock: ____________________________________________ • Give an example of a Course-Grained Igneous Rock: ______________________________________

  13. Composition of Igneous Rocks • Mineral Composition of igneous rocks is determined by the chemical composition of the magma from which the rock formed. • Three families of igneous rock: • Felsic • Mafic • Intermediate

  14. Composition Families

  15. Intrusive Rock Structures • Igneous Rock masses that form underground are called INTRUSIONS. • 5 types of intrusions: • Batholiths—largest of all intrusions, larger than 100 km squared, form the core of mountains • Stocks—same as a batholith but smaller than 100 square km. • Laccoliths— “lake of rock”, when magma flows between rock layers and spreads upward into a dome shape. • Sills-when magma flows between the layers of rock and hardens. Always parallel to the layers of rock below and above. • Dike-Magma that forces itself through vertical fractures and solidifies.

  16. Extrusive Rock Structures • Igneous rock masses that form on Earth’s surface are called EXTRUSIVE ROCK STRUCTURES. • Lava from a volcano that cools and becomes rock is an EXTRUSIVE ROCK STRUCTURE.

  17. Animated Intrusive and Extrusive Features

  18. Quick Check!! • What is the difference between Intrusive and Extrusive Rock Structures? __________________________________________________________________________________________________________________________________________ • What is Felsic Rock? ____________________________________________________________________________________________ • Name and Define 2 types of Intrusive Rock Structures: ________________________________________________________________________________________________________________________________________________________________________________________

  19. Assessment In groups create posters for one of the following: • Intrusive • Extrusive • Course-Grained • Fine-Grained • Felsic • Mafic • Intermediate

  20. Daily Quiz

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