1. Coach Williams Room 310B

2.  Igneous Rocks

3.  What are Igneous Rocks

4.  Crystallized magma  “Ignis” = fire  Lava- magma flowing onto surface

5.  Extrusive ◦ Cool quickly, fine-grained, on surface  Intrusive ◦ Cool slowly, coarse-grained, beneath surface

7.  Slushy mix of molten rock, gases, minerals  SiO 2 most abundant  800 – 1200 ° F to melt rocks  Factors that affect magma ◦ Temperature- deeper = hotter ◦ Pressure- deeper = more pressure ◦ Water- affects melting point ◦ Minerals- affects melting point

8.  http://geology.com/rocks/igneous-rocks.shtml http://geology.com/rocks/igneous-rocks.shtml

9.  Partial Melting ◦ Different substances, different melting points ◦ Rock parts melt at different temperatures  Fractional Crystallization ◦ Magma cools and crystallizes ◦ Rock parts crystallize at different temperatures

10.  Relationship: cooling magma/mineral formation