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Igneous Rocks
Pre-Assessment
1. Which of the following types of rock is produced by magma that cools
deep below the earth's crust?
A. extrusive igneous
B. intrusive igneous
C. foliated metamorphic
D. chemical sedimentary
2. The texture of igneous rock is determined by the rate at which
magma
A. flows from a volcano
B. cools
C. melts
D. compresses
3. A common igneous rock is
A. granite
B. gold
C. quartz
D. limestone
What is an Igneous Rock?
Hint: the word igneous comes from the Latin word ignis
which means fire
An Igneous rock is a rock that is formed from cooled
magma or lava
What is the difference between magma and lava?
Answer: Magma is molten rock below Earth’s
surface and lava is molten rock above Earth’s
surface
Where the molten rock cools plays a BIG part
in what type of Igneous rock will be formed
Today we are learning about igneous rocks,
but to help us understand, let’s first watch
a video about all rocks!
• Extrusive Igneous rocks – these are rocks that
form from cooled lava (outside of Earth’s
crust)
• The most common example is Basalt
What volcanic islands
are primarily made
of basalt?
• Extrusive igneous rocks cool quickly so that are
what we call fine-grained because they have
small crystals
• Intrusive igneous rocks – form from cooled
magma (molten rock that has hardened inside
Earth’s crust)
• The most common example is Granite
• Intrusive igneous rocks cool slowly so they are
what we call coarse-grained because they
have large crystals