Divergent Plate Boundaries Presentation.ppt

plate boundaries

1. Divergent Plate Boundaries
The Earth is Tearing Itself Apart

2. 2
1.Grab your pairing card.
2.Take a seat with your
partner.
3.Look over your notes from
yesterday’s class on
Convergent Boundaries and
Subduction.
Divergent Plate Boundaries
Welcome to Class!
https://rmgsc.cr.usgs.gov/gme/

3. 3
Whiteboard Review Rules
1.Read the question and write your answer
on your whiteboard.
2.You may use your notes, but not your
partner to answer the question.
3.Do not show your board until I say so.
4.Ready? Let’s go!
Divergent Plate Boundaries

4. 4
Question #1:
At convergent boundaries, Earth’s plates are
_______:
A.Not moving.
B.Moving towards each other.
C.Moving away from each other.
D.Being created.

5. 5
Question #1 Answer:
B. Moving towards each other.
Convergence of the Nazca and South American Plates
https://pubs.usgs.gov/publications/text/Nazca.html

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Question #2:
When two plates collide, the heavier of the
two is pulled under the lighter plate in a
process called ______:

7. 7
Question #2 Answer:
Subduction!
https://pubs.usgs.gov/gip/dynamic/graphics/Fig21oceancont.gif

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Question #3:
What are the three types of subduction
zones found on Earth?

9. 9
Question #3 Answer:
Oceanic-Continental Convergence
Oceanic-Oceanic Convergence
Continental-Continental Convergence

10. 10
https://pubs.usgs.gov/gip/dynamic/understanding.html#anchor15039288

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Question #4:
What is the gravity-controlled process where
a cold, denser oceanic slab sinks into a
subduction zone?

12. 12
Question #4 Answer:
Slab Pull – the process drags the rest of the plate
with it!
https://pubs.usgs.gov/gip/dynamic/graphics/Fig32.gif

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Question #5:
What other process depicted on this image
do scientists believe aid in the movement of
Earth’s plates?
https://pubs.usgs.gov/gip/dynamic/graphics/Fig32.gif

14. 14
Question #5 Answer:
Convection Cells – a process similar to
boiling water!

15. 15
Question #6:
Based on your knowledge of what a
Convergent Boundary is, what do you think
happens at a Divergent Boundary?

16. 16
Question #6 Answer:
Earth’s plates are
moving away from each other!
https://pubs.usgs.gov/publications/text/
ridge.html

17. 17
Agenda:
1.Whiteboard Review!
2.Divergent Boundary Model
3.Class Discussion
4.Divergent Boundaries of Earth Activity
5.Recap/Exit Ticket?
Divergent Plate Boundaries

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Today’s Learning Objectives:
1.Students will be able to explain Divergent
Boundaries and their features.
2.Students will be able to identify features of
Divergent Boundaries.
Divergent Plate Boundaries

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Divergent Boundary Model
1.Feed the paper through the center cut of the
poster board piece.
2.Feed one paper through the right cut in the
cardboard and another through the left cut.
3.Tape the paper to create loops as shown below:
Divergent Plate Boundaries

20. 20
Divergent Plate Boundaries
Divergent Boundary
Convergent Boundary Convergent Boundary

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Divergent Plate Boundaries

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Divergent Boundaries – Oceanic Plates
Oceanic ridges are the result or rising convection
currents that lifts the lithosphere.
Divergent Plate Boundaries

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Divergent Boundaries – Continental Plates
Continental rifts are the result of the convection forces
inside the Earth arching the plate upwards and fracturing
it.
Divergent Plate Boundaries

24. 24
True/False – Thumbs Up/Thumbs Down
For each of the following statements, put your
thumb up or down depending on if it is true or
false.
TRUE = THUMBS UP
FALSE = THUMBS DOWN
Divergent Plate Boundaries

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True/False – Thumbs Up/Thumbs Down
A divergent boundary happens when Earth’s tectonic
plates move away from each other
TRUE = THUMBS UP
FALSE = THUMBS DOWN
Divergent Plate Boundaries

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True/False – Thumbs Up/Thumbs Down
A ridge occurs when continental plates are moving
away from each other
TRUE = THUMBS UP
FALSE = THUMBS DOWN
Divergent Plate Boundaries

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True/False – Thumbs Up/Thumbs Down
The convection currents can lift both oceanic and
continental crust easily, resulting in clean breaks at
divergent boundaries.
TRUE = THUMBS UP
FALSE = THUMBS DOWN
Divergent Plate Boundaries

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True/False – Thumbs Up/Thumbs Down
The geological process known as “Slab Pull” helps
drive the plates away from the divergent boundary,
leading to new formation of crust.
TRUE = THUMBS UP
FALSE = THUMBS DOWN
Divergent Plate Boundaries

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Where in the World are Divergent Plate
Boundaries?
•Using the Tectonic Plates map and your stations
worksheet, explore three different divergent plate
boundaries on Earth!
•You will have 6 minutes at each station.
•Note: there are more than just 3 divergent
boundaries on Earth!
Divergent Plate Boundaries

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Divergent Plate Boundary

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Parking Lot Exit Ticket
•Tomorrow: we will look at how fast the Earth’s plates
are moving and how polarity has changed over the
course of Earth’s life.
•On a Post-It-Note:
What is one thing you found interesting from today’s
lesson?
What is one thing you would like to know more about
after today’s lesson?
•Sign your name and put it on our parking lot as you leave!
Divergent Plate Boundaries