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Igneous Rocks
Chapter 4, Section 2
Igneous Rocks
_____________________ is Latin for _________________
All igneous rocks form from _____________________
– Magma _____________________ between 700 and
_____________________ degrees Celcius
Classified in 2 ways
• _____________________ composition
• _____________________ the magma cooled down into
_____________________
Igneous Rock Formation
Rock melts in _____________ ways
– ____________________
• Temp _____________________ and causes rock to melt
– _____________________ minerals melt at different
_____________________
– _____________________
• High _____________________ causes enormous heat BUT also keeps
rocks from _____________________
• Rocks _____________________ towards surface
• _____________________ in pressure allows the rock to
________________
Igneous Rock Formation
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3 ways rock can melt
• _____________________
• Fluids such as _____________________ enter a rock
• _____________________ point _____________________ enough for
the rock to melt
Composition of Igneous Rocks
Scientists have classified ___________ types of magma
– _____________________ and _____________________
– Differ in _____________________ composition
Types of Magma
– _____________________
– High percentage of _____________________
– _____________________ flowing
– Mainly _____________________ colored _____________________
– Example: _____________________
– _____________________
– _____________________ percentage of _____________________
– _____________________ and faster flowing
– Mostly _____________________ minerals
– Example: _____________________
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Textures of Igneous Rocks
_____________________ size of igneous rocks depend on how
_____________________ the magma cooled.
Slow _____________________ magma allows _____________________
crystals to form
_____________________ cooling magma has much
_____________________ crystals.
Thinking Question: What determines whether magma cools quickly or slowly?
Textures of Igneous Rocks
_____________________ Rocks
– Magma cools on _____________________
– Much _____________________ than cooling within the Earth
– What size crystals form?
• _____________________ – often invisible to the naked eye
_____________________ Rocks
– Magma cools _____________________ the Earth’s surface
– Much _____________________ cooling
– Large _____________________ form
Textures of Igneous Rocks
– _____________________
– Large _____________________ in a _____________________ rock
– Forms due to _____________________ in freezing points of
_____________________
– Minerals with high _____________________ points form crystals
– Minerals with _____________________ freezing points remain
_____________________ until later
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Texture of Igneous Rocks
Some rocks cool so quickly, _____________________ are trapped inside
Result is a _____________________, _____________________ rock
– _____________________
– _____________________