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Igneous Rocks
Formed from the cooling of lava or magma
Igneous Rocks are Divided into Two Groups
Intrusive Extrusive
Intrusive Igneous
• Formed from cooling MAGMA• Forms deep INSIDE the Earth’s crust• Crystals have more time to grow, so they are
LARGER• Described as COARSE-GRAINED
Intrusive Igneous Examples
Granite Syenite
Intrusive Igneous Examples
Diorite Gabbro
Extrusive Igneous
• Formed from cooling LAVA• Forms OUTSIDE the Earth• Crystals have LESS time to grow, so they are
SMALLER OR NON-EXISTANT• Described as FINE-GRAINED
Extrusive Igneous Examples
Obsidian Scoria
Extrusive Igneous Examples
Basalt Pumice
Quiz Question 1
• This is an extrusive igneous rock
• It has a glassy texture
• It has been used throughout history to make knives and arrow heads.
Quiz Question 1
• This is an extrusive igneous rock
• It has a glassy texture
• It has been used throughout history to make knives and arrow heads.
• Answer: Obsidian
Quiz Question 2
• Can you name this extrusive igneous rock that is often used in foot-care?
Quiz Question 2
• Can you name this extrusive igneous rock that is often used in foot-care?
• Answer: Pumice
Quiz Question 3
• This is an intrusive igneous rock
• It has coarse-grained texture
• It is composed of the minerals: quartz, feldspar, and mica
Quiz Question 3
• This is an intrusive igneous rock
• It has coarse-grained texture
• It is composed of the minerals: quartz, feldspar, and mica
• Answer: Granite