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Published byTheodore Terry Modified over 9 years ago
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Igneous Rocks
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Formed from the cooling of lava or magma
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Igneous Rocks are Divided into Two Groups IntrusiveExtrusive
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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
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Intrusive Igneous Examples GraniteSyenite
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Intrusive Igneous Examples DioriteGabbro
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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
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Extrusive Igneous Examples ObsidianScoria
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Extrusive Igneous Examples BasaltPumice
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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.
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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
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Quiz Question 2 Can you name this extrusive igneous rock that is often used in foot-care?
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Quiz Question 2 Can you name this extrusive igneous rock that is often used in foot-care? Answer: Pumice
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Quiz Question 3 This is an intrusive igneous rock It has coarse-grained texture It is composed of the minerals: quartz, feldspar, and mica
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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
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