Download Igneous Rocks

TODAY’S AGENDA…
Bellringer: Get your clickers and a Coach
book. Complete Lesson 5 in the Coach
Book. Read the information and answer
the 4 questions. Put your answers in the
clicker.
Review Rock Cycle Worksheet (SP#2)
Notes on Igneous Rocks (SP#3)
UNDERSTANDING THE ROCK CYCLE
What is created when sedimentary
rock is under heat and pressure?
What is created when igneous rock
is weathered or eroded?
What is created when sedimentary
rock is melted?
What is created when metamorphic
rock is melted and then cooled?
UNDERSTANDING THE ROCK CYCLE
What is created when igneous rock
is under heat and pressure?
What is created when metamorphic
rock is weathered and eroded?
What is created when magma cools?
What is created when sediment is
compacted and cemented?
WHAT YOU NEED…
Book on page 62
Paper (Study Pack #3)
IGNEOUS ROCKS
Study
Pack
#3
TODAY’S GOALS…
I can recognize magma and lava as
the materials that cool to form
igneous rocks.
I can contrast the formation of
instrusive and extrusive igneous
rock.
I can contrast granitic, basaltic, and
andesitic igneous rock.
INSIDE THE EARTH
Layers of the Earth
Crust – outer most layer
Mantle – molten rock (magma)
Outer Core – melted metal
Inner Core – solid metal ball that
spins
INSIDE THE EARTH
FORMATION OF IGNEOUS ROCKS
When hot magma cools and hardens
it forms igneous rock
Igneous means “fire”
FORMATION OF IGNEOUS ROCKS
Magma comes from deep below
Earth’s surface and is pushed
upward because it is less dense than
surrounding rock
When magma
reaches earth’s
surface it is
called lava
TYPES OF IGNEOUS ROCKS
Split into two groups
Intrusive Igneous Rocks
Extrusive Igneous Rocks
How do they compare?
INTRUSIVE ROCKS
Figure 6 on page 63
Rocks that form from magma below
the surface
Found only when the layers of rock
and soil above them are worn away
Takes a long time for them to cool
Create visible mineral grains
Coarse grained
INTRUSIVE ROCKS
EXTRUSIVE ROCKS
Formed as lava cools on the Earth’s
surface
Air and water cause it to cool more
quickly
Keeps mineral grains from growing
large
Fine grained
EXTRUSIVE ROCKS
COMPARE THEM!
TYPES OF IGNEOUS ROCKS
Page 64
What is the difference between
intrusive and extrusive igneous rock?
VOLCANIC GLASS
Some rocks cool so quickly they
have few or no mineral grains
present
Some of the gases can also be
trapped in the rocks and form holes
CLASSIFYING IGNEOUS ROCKS
You can also classify these rocks by
the magma from which they form
Basaltic
Andesitic
Granitic
What are the differences?
BASALTIC
Dense
Dark colored
Made up of iron and magnesium
Black beach in
Hawaii
GRANITIC
Light-colored
Lower density than basaltic
Thick and stiff
Lots of silica
Can cause explosive eruptions
ANDESITIC
Characteristics between basaltic and
granitic