Transcript rocks and rock cycle ppt

1. Name the 3 kinds of rocks
2. What are rocks?
3. How are rocks classified?
4. Which kind of rock would you most likely find near a volcano. Describe its
formation.
5. What is the difference between weathering and erosion
Bellwork
Determine if the following are True or False
1. Igneous rocks are only found within the earth.
2. Molten rock found on the surface of the earth is called coral.
3. Molten rock is only found close to the surface.
4. Compaction and cementation of sediments are key processes
involved in the formation of sedimentary rocks.
5. The process of rain wearing down rocks is an example of
weathering.
6. Moving water is a minor force in transporting sediment
7. Sand once existed as rock.
8. The rock cycle only flows in one direction.
9. Magma is the result of rocks being heated into liquid rock.
10. Erosion is responsible for transporting sediment.
http://www.youtube.com/watch?v=ihfKNRdlE2E
Rocks and the Rock Cycle
EQ: what is the rock cycle?
SC.7.E.6.2
Describe the series of processes and classes
of rocks that make up the rock cycle.
What is Rock?
• A naturally occurring solid mixture made up of
minerals and organic matter.
• Rocks are always changing, the study of rocks
can help scientists learn how earth has
changed over time
What processes change rock?
• Natural processes can change rock from one form to
another and shape features of our planet.
Weathering
Erosion
Deposition
Cementation
• breaking rock into fragments called sediment.
• Caused by wind, water, ice, and changes in temp
• Movement of sediment from one place to another
• Caused by gravity, ice , water, wind
• Sediments are deposited (dropped) in bodies of
water or low lying areas
• Weight from above presses sediments together and
the minerals dissolve
What are the types of rocks
• Rocks are classified based on how they form
igneous
• Forms from cooling lava and magma
that becomes solid
• Magma = molten rock underground
• Lava = magma that has reached the
surface
Intrusive: formed slowly IN the
ground, form larger mineral crystals
Extrusive: formed above ground,
smaller crystals
Magma = molten rock
below the earth’s surface
Lava = molten rock
flowing on the earth’s
surface
Granite
Rhyolite
In what ways are the two rocks similar?
Both are from melted rock
Their composition is the same
16. What causes the two rocks to be different?
Granite
Rhyolite
Granite – Slow cooling below the earth’s surface
Rhyolite – Quick cooling on the earth’s surface
15. In what ways are the two rocks different?
Granite
Rhyolite
Granite – coarse texture, made from magma
Rhyolite – fine texture, made from lava
Sedimentary
• Formed when sediment from other rocks are
pressed and cemented together
• Where fossils form.
• Can be made from organic material or pieces
of other rock
Types of Sedimentary Rocks
Sandstone
Limestone
Gypsum
Conglomerate
Shale
Metamorphic
• Formed when heat and pressure change the
mineral content of the rock.
• EX: a rock can be buried deep in crust, where
temp and pressure are high. Over millions of
years they change chemically
Types of Metamorphic Rocks
Schist
Gneiss
What is the rock cycle
• The process in which rock changes from one
type to another.
• melting and cooling it forms igneous rock
• Pressing and cementing together =
sedimentary
• transformed under heat and pressure =
metamorphic rock
1. Why is it important to have a basic
understanding of the rock cycle?
Rocks contain clues about the environment.
Helps us understand the formation of the earth.
Forces inside the earth and at the surface build, destroy, and change the
rocks in the crust
How do tectonic plate motions affect
the rock cycle?
Tectonic plates – blocks of the lithosphere that
are made of crust and upper mantle
Plates move on the mantle and move rock
around.
uplift
• Rising of regions of the crust to higher
elevations
• Increases the rate of erosion of rock
subsidence
• Sinking of regions of crust to lower elevations
• Leads to basins where sediments can be
deposited
Rift zones
• A set of deep cracks between 2 plates that pull
apart.
• May cause areas where magma may form and
cool to igneous rocks.
Bellwork
1.
2.
3.
4.
5.
Why do scientists study rock?
What are the 3 types of rock
How are igneous rocks formed
How are metamorphic rocks formed
What 4 processes go into the formation of
sedimentary rock?
6. How does uplift help form rocks?
7. How does subsidence help form rocks?
8. How do rift zones help form rocks?
Rock cycle review
• http://www.purposegames.com/game/rockcycle-quiz
• http://www.neok12.com/diagram/Types-ofRocks-01.htm
Notes Quiz: Put all answers on the index card provided. You may
use your own notebooks, but not your neighbor’s.
1. Which type of rock is formed by magma or lava?
2. List 4 processes that help to form sedimentary rock.
3. What does the study of rocks help scientists learn?
4. Which kind of plate movement might increase the rate of
erosion in rocks?
5. What kind of rocks might form at a rift zone?
6. Label the parts of the rock cycle below:
A
B
C
How do we illustrate the rock cycle?
• http://www.brainpop.com/science/earthsyste
m/rockcycle/
http://www.youtube.com/watch?v=SRaInMDNyE8
http://www.msnucleus.org/membership/storybooks/ricky.html
• http://www.learner.org/interactives/rockcycle
/diagram.html
bellwork
1. Describe the type of
rock you might find at
each locations A – D
and describe why.
2. What is the difference
between erosion and
weathering?
3. List the steps in
formation of
sedimentary rock
4. You find a rock near a
volcano with large
crystals.
A. What kind of rock is it?
B. Describe its formation
(where and from
what)
Practice quiz
• http://wps.prenhall.com/esm_tarbuck_earth_
8/0,9073,1298259-,00.html