· First, carefully remove the top cookie (you must twist it!)
· Next, break the top cookie in half. As you do so, listen to the sound it makes.
What sound do you hear (describe it)?
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Describe what happens to the plates at a divergent plate boundary and draw the movement with ARROWS in the box.
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Describe what happens to the plates at a convergent plate boundary and draw the movement with ARROWS in the box.
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Describe what happens to the plates at a transform plate boundary and draw the movement with ARROWS in the box.
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Today we are going use an Oreo to learn about tectonic plates. The TOP cookie represents the tectonic plates (which are found on the top of the earth) and the icing/filling represents magma/lava (found under the plates).
Which of the following is true?
The cookie is the earth and the icing is water
The icing/filling represents the Tectonic Plates and the cookie represents magma/lava
The oreo cookie represents the Tectonic Plates and the icing/filling represents magma/lava
What natural disaster would cause a crack in the earth and would make a sound similar to that?
Floods
Hurricanes
Earthquakes
Let’s look at divergent plate boundaries. Divergent boundaries are where the two plates MOVE AWAY from each other - like shown above.
What does divergent mean?
Moving apart
Moving together
Sliding past each other
Put one pointer finger on each broken half. Now push down (lightly) on the two broken cookie halves and pull them apart. What happens to the icing/filling?
Filling moves up in between the cookies
The edges of the cookie rub together and break apart
The cookies push together and rise up
When tectonic plates move away from each other at divergent boundaries, the magma is pushed up to the surface, hardens and creates new "ground" called sea floor. This is called sea floor spreading - beause the sea floor is literally "spreading out" and becoming larger
What landform is created at divergent boundaries?
Earthquakes
New sea floor
Volcanoes
Mountains
When tectonic plates move away from each other at divergent boundaries, the magma is pushed up to the surface, hardens and creates new "ground" called sea floor. This is called sea floor spreading - beause the sea floor is literally "spreading out" and becoming larger
What causes the new sea floor at divergent boundaries?
The plates sliding on top of each other
The plates moving towards each other
The magma being pushed to the surface and cooling/hardening
Now let’s look at convergent plate boundaries.Convergent means that two tectonic plates move TOWARDS each other.
Moving apart
Sliding past each other
Moving together
Take the two cookie halves and slowly push them toward each other. Push one half of the broken cookie under the other half of broken cookie. What happens to the filling as the plates slide together?
The filling moves up in between the cookies
The filling changes color
The edges of the cookie rub together and break apart
What happens to the cookies as they push against each other?
The cookies push together and rise up
The edges of the cookie rub together and break apart
Filling moves up in between the cookies
What landforms do you think the cookies represent at this point?
Earthquakes
New sea floor crust
Mountains/volcanoes
What type of plate boundary created mountains and volcanoes?
Seafloor spreading
Convergent (plates moving towards each other) -> <-
Divergent ( plates moving away from each other) <- ->
Now let’s look at a transform plate boundary. Try sliding the two cookie pieces laterally past one another, over the creamy filling. What do you notice about the cookie edges?
The cookies push together and rise up
Filling moves up in between the cookies
The edges of the cookie rub together and break apart
You can feel and hear that the “plates” do not slide smoothly past one another, but rather stick and then let go. This phenomenon in the real world is described as
Mountains/volcanoes
New sea floor crust
Earthquakes
What type of plate boundary creates earthquakes?
Convergent (plates moving towards each other) -> <-
Divergent ( plates moving away from each other) <- ->
Transform (plates moving opposite/past each other) ^ v
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What causes tectonic plate movement?
They float on top of water
Solar radiation
Magma convection cells
Tectonic plates do not move
Match the three types of CONVERGENT plate boundaries with their land formations
Oceanic - Continental
Mountains
Oceanic - Oceanic
Mountains, volcanoes
Continental - Continental
Trench, island arcs, volcanoes
A zone of active volcanoes that encircles the Pacific Ocean
Volcano islands
Ring of Volcanoes
Ring of Fire
Hot death
Why do hotspots occur?
Subduction zones cause magma to rise up when a plate is pushed into the mantle
Magma is formed at a continental-continental convergent zone
Magma burns through oceanic plate and creates an island chain
At the boundaries between tectonic plates, sudden movements that are created when the plates slide past each other are called
Volcanoes
Trenches
Mountains
Earthquakes
What happens to magma at divergent boundaries?
Ocean water falls into the center of the Earth
Tectonic plates never move
Earthquakes
Rises up to form new ocean floor
What is the subduction zone?
The less dense oceanic plate moves over the other plate
The more dense oceanic plate moves under the other plate
The more dense continental plate moves under the other plate
At this site a 9.0 magnitude earthquake, which occurred at a nearby subduction zone, triggered one of the largest nuclear reactor disasters in history.
A
B
C
D
Some of Earth’s landforms are created by hotspots where a plate rides over a fixed “plume” of hot mantle, creating a line of volcanoes. Imagine if a piece of hot, glowing coal were imbedded in the creamy filling – a chain of volcanoes would be burned into the overriding cookie. Name a location on Earth where this occurs.
Middle of North American Plate
Middle of Eurasian Plate
Hawaii
What type of plate boundary is this an example of?
Convergent
Divergent
Transform
What type of plate boundary is this an example of?
Transform
Divergent
Convergent
What type of plate boundary is this an example of?
Convergent
Divergent
Transform
What type of plate boundary is this an example of?
Transform
Convergent
Divergent
What type of plate boundary is this an example of?
