coach williams room 310b. igneous rocks what are igneous rocks
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Earth ScienceCoach Williams
Room 310B
Igneous Rocks
Chapter 5
What are Igneous Rocks
5.1
Crystallized magma “Ignis” = fire Lava- magma flowing onto surface
Igneous Rocks
Extrusive◦ Cool quickly, fine-grained, on surface
Intrusive◦ Cool slowly, coarse-grained, beneath surface
Types of Igneous Rocks
Identify: Igneous Rocks
Slushy mix of molten rock, gases, minerals SiO2 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
Magma
http://geology.com/rocks/igneous-rocks.shtml
Pictures of Igneous Rocks
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
How Rocks Melt
Relationship: cooling magma/mineral formation
Bowen’s Reaction Series
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