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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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Key terms
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
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.

Partial melting
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.

Fractional crystallization
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.

Fractional crystallization1
Fractional Crystallization

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


  • Create and Acrostic Poem using the word IGNEOUS.

  • I

  • G

  • N

  • E

  • O

  • U

  • S

Quick check
Quick Check!!

  • Name the 2 types of Igneous Rock: ____________________________________________

  • Give an example of a Course-Grained Igneous Rock: ______________________________________

Composition of igneous rocks
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

Intrusive rock structures
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.

Extrusive rock structures
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.

Quick check1
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: ________________________________________________________________________________________________________________________________________________________________________________________


In groups create posters for one of the following:

  • Intrusive

  • Extrusive

  • Course-Grained

  • Fine-Grained

  • Felsic

  • Mafic

  • Intermediate