ROCK CYCLES
The Rock Cycle
The Rock Cycle
Introduction
Lesson
Quiz
Rocks are always
changing and
moving
throughout the
different phases
of the rock cycle.
Igneous Rocks
The Rock Cycle
Igneous Rocks
Introduction
Lesson
Quiz
Igneous Rocks
o
Introduction
Igneous Rocks are formed when molten magma
becomes solid.
o
o
o
Lesson
There are two kinds of igneous rocks:
o
o
Quiz
Molten- melted
Magma on the surface of the Earth is called lava
Intrusive Igneous Rocks- magma becomes solid
underground.
Extrusive Igneous Rocks-lava cools and becomes a solid
on Earth’s surface.
Igneous Rocks
o
Introduction
o
o
Lesson
Quiz
Intrusive Igneous Rocks have large grains and
may be various colors.
Examples: granite, gabbro
Extrusive Igneous Rocks have small grains and
also, may be various colors.
o
Examples: basalt, pumice
Sedimentary Rocks
The Rock Cycle
Sedimentary Rocks
Introduction
Lesson
Quiz
Sedimentary Rocks
o
Introduction
Sedimentary Rocks are layered rocks
formed from fragments and broken bits
of rock.
o
Lesson
o
Quiz
These bits of broken rock are a result of
weathering and erosion.
The fragments of rock eventually cement
and compact together to form a layered
rock.
Sedimentary Rocks
o
Introduction
The size and texture of sedimentary
rocks depend on what kind of
fragments make up the rock.
o
Lesson
Quiz
Sedimentary Rocks can be made of sand,
gravel, broken seashells, or even just
layers of mud.
Metamorphic Rocks
The Rock Cycle
Metamorphic Rocks
Introduction
Lesson
Quiz
Metamorphic Rocks
o
Introduction
o
Lesson
o
When the sedimentary or igneous rocks are
pushed down into the ground, they will be under
greater pressure and heat.
This will cause the crystals of the sedimentary
rocks to change and become a new kind of rock,
called metamorphic rock.
There are two kinds of metamorphic rocks:
o
Quiz
o
Contact Metamorphic Rocks- forms when magma
inside the Earth comes up into an already existing
rock and “bakes” it.
Regional Metamorphic Rocks- forms when rocks
already deep inside the Earth change because of
heat and pressure
Metamorphic Rocks
o
Introduction
Metamorphic Rocks may be foliated or
nonfoliated:
o
o
Lesson
o
Quiz
Foliated means that the rocks have
recognizable parallel bands.
Example: slate, schist
Nonfoliated means that the rocks do not
have these bands; they appear smooth.
o
Example: quartzite, marble
Are you ready for a quiz?
Introduction
Lesson
Quiz
Yes
No. I need to
review the
material.
Quiz

Introduction
Question #1. Which kinds of rocks are
formed from molten lava?
Sedimentary Rocks
Lesson
Metamorphic Rocks
Quiz
Igneous Rocks
Quiz

Correct!
Introduction

Lesson
Quiz
Igneous Rocks are formed from either
molten magma inside the Earth, or
molten lava outside the Earth.
Quiz

Introduction
Question #2. What causes
metamorphic rocks to form?
Heat and Weather
Lesson
Heat and Pressure
Quiz
Climate and Pressure
Quiz

Correct!
Introduction

Lesson
Quiz
The pressure from rocks above will push
the metamorphic rock farther down,
where it will be exposed to greater
heat. This combination of heat and
pressure will cause the crystals in the
rock to change and become a new rock:
metamorphic rock.
Quiz

Introduction
Lesson
Question #3. Bits and pieces of rock
form sedimentary rocks? Where do
these fragments of rock come from?
The underlying molten magma
Weathering and Erosion
Quiz
Quiz

Correct!
Introduction

Lesson
Quiz
Weathering occurs first; wind, water,
etc. cause bits and pieces of rock to
break off. Then erosion occurs when
these fragments are carried away and
deposited somewhere else.
Quiz

Introduction
Question #4. What kind of igneous
rocks form underground?
Extrusive Igneous Rocks
Lesson
Cemented Igneous Rocks
Quiz
Intrusive Igneous Rocks
Quiz

Correct!
Introduction

Lesson
Quiz
Intrusive Igneous Rocks are formed from
molten magma becoming solid
underneath the Earth’s surface.
Quiz

Introduction
Lesson
Question #5. ___________forms when
magma inside the Earth comes up and
“bakes” the nearby rocks.
Contact Metamorphism
Regional Metamorphism
Quiz
Local Metamorphism
Quiz

Correct!
Introduction

Lesson
Quiz
Contact Metamorphism occurs when
magma comes up into another rock and
bakes the nearby rocks.
Quiz

Introduction
Lesson
Question #6. Are rocks always
changing and moving throughout the
different phases of the rock cycle?
Yes.
No.
Quiz
Quiz
Introduction
Lesson
Quiz

Correct!

The Rock Cycle is a never-ending process. For example:
o
An extrusive igneous rock is exposed to weathering.
o
A channel of water carries this weather igneous rock down a slope into a lake.
o
Layers of weathered igneous rock build up in the lake and eventually are
cemented together.
o
Layer after layer forms on top of the igneous rock and it becomes a layered
sedimentary rock.
o
After much time, this sedimentary rock is pushed down into the Earth and
becomes exposed to heat.
o
This heat and pressure cause the grains of the rock to change and become a
new kind of rock: metamorphic rock.
o
This metamorphic rock, over time, continues to be pushed farther into the Earth
until it finally melts into magma.
o
This magma may eventually come in contact with a way “out”, such as a
volcano.
o
The magma flows out of the volcano in the form of lava, becomes solid, and
forms and extrusive igneous rock.
o
And the cycle starts over.
The End
OOPS! Try Again!
Introduction
Question #1
Question #2
Lesson
Question #3
Question #4
Quiz
Question #5
Question #6
The End

Click for Works Cited
Works Cited
Academic Content Standard
Grade 6
Earth and Space Sciences
-Earth Systems
1. Describe the rock cycle and explain that there are sedimentary, igneous,
and metamorphic rocks that have distinct properties (e.g., color, texture) and
are formed in different ways.
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