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Igneous Rocks
Earth Science - Middle School
❮
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2
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Igneous
Rocks
© Copyright NewPath Learning. All Rights Reserved. 94-4671
Visit
www.newpathlearning.com
for
Online
Learning
Resources.
magma
lava
Formation
of
Igneous
Rock
Igneous
rocks
form
from
cooling
magma
and
lava.
They
are
classified
according
to
their
mineral
origin,
texture
and
composition.
The
origin
of
igneous
rocks
is
either
intrusive
or
extrusive.
Cooling
magma
below
the
Earth’s
surface
forms
intrusive
rocks,
while
erupting
lava
forms
extrusive
igneous
rocks.
Classifying
Igneous
Rocks
The
texture
of
an
igneous
rock
is
related
to
how
long
it
takes
to
cool.
Slow-cooling
rock
forms
more
crystals
and
is
coarse-grained,
while
fast-cooling
rock
has
fine
grain.
Intrusive
Extrusive
basalt
pumice
granite
magma
chamber
magma
obsidian
Extrusive
Intrusive
Dark
igneous
rocks,
referred
to
as
mafic,
have
high
concentrations
of
calcium,
iron
and
magnesium.
Light
igneous
rocks
are
described
as
felsic,
and
they
have
high
concentrations
of
silica,
aluminum
and
potassium.
Basalt
is
a
dark
igneous
rock
with
visible
crystals.
It
is
the
most
common
extrusive
rock,
forming
most
of
the
ocean’s
crust.
Obsidian
is
a
dark,
glassy,
extrusive
igneous
rock.
It
cools
so
quickly
that
it
does
not
have
visible
crystals.
When
lava
froths
up
with
gases,
a
lightweight
rock
called
pumice
is
formed.
It
is
the
only
rock
that
can
float
on
water.
Granite
is
a
light
colored
intrusive
igneous
rock
with
visible
crystals.
It
is
an
abundant
rock,
found
at
the
core
of
most
mountains.
lava
quartz
silica
50-70
%
silica
Pause
and
Review
Describe
the
composition,
texture
and
origin
of
these
igneous
rocks.
Igneous
Rocks
Color
Classication
Origin
Example
Mineral
Concentrations
obsidian
basalt
granite
IGNEOUS
ROCKS
pumice
© Copyright NewPath Learning. All Rights Reserved. 94-4671
Visit
www.newpathlearning.com
for
Online
Learning
Resources.
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