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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Plates move in THREE basic ways. Let’s take a look at each.
Choose a cookie. Don’t eat it… yet!
· First, carefully remove the upper cookie (you must twist it!)
· Slide the upper cookie over the creamy filling. This motion simulates the movement of a rigid lithospheric plate over the softer asthenosphere.
· Next, break the upper cookie in half. As you do so, listen to the sound it makes.
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What sound do you hear (describe it)?
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How many major tectonic plates are there?
6
3
9
12
What causes tectonic plate movement?
Tectonic plates do not move
Solar radiation
Magma convection cells
They float on top of water
Match the three types of CONVERGENT plate boundaries with their land formations
Oceanic - Oceanic
Mountains
Continental - Continental
Mountains, volcanoes
Oceanic - Continental
Trench, island arcs, volcanoes
A zone of active volcanoes that encircles the Pacific Ocean
Ring of Fire
Ring of Volcanoes
Volcano islands
Hot death
Why do hotspots occur?
Magma burns through oceanic plate and creates an island chain
Subduction zones cause magma to rise up when a plate is pushed into the mantle
Magma is formed at a continental-continental convergent zone
At the boundaries between tectonic plates, sudden movements that are created when the plates slide past each other are called
Volcanoes
Trenches
Earthquakes
Mountains
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 more dense continental plate moves under the other plate
The more dense oceanic plate moves under the other plate
The less dense oceanic plate moves over the other plate
What does that breaking represent?
Moving plates
Earthquake
Let’s look at divergent plate boundaries. Divergent means
Moving together
Moving apart
Sliding past each other
Now push down on the two broken cookie halves and slide them apart. What happens to the creamy filling?
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 does this represent?
New sea floor crust
Earthquakes
Mountains
Now let’s look at convergent plate boundaries.Convergent means to
Moving together
Sliding past each other
Moving apart
Take the two cookie halves and slowly push them toward each other. What happens to the filling as the plates slide together?
The filling moves up in between the cookies
Filling moves up in between the cookies
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
Filling moves up in between the cookies
The edges of the cookie rub together and break apart
What does this represent?
Earthquakes
Mountains/volcanoes
New sea floor crust
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 edges of the cookie rub together and break apart
Filling moves up in between the cookies
The cookies push together and rise up
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
Earthquakes
New sea floor crust
Mountains/volcanoes
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.