Friday, September 9, 2016

Science Quest # 12 - Plate techtonics

Today we are going to do some online gaming before we get started!

Go to  the following website and play the slip- slide- collide game!

http://www.open.edu/openlearn/science-maths-technology/slip-slide-collide

Interested in trying it yourself?

Grab a baking pan (with the most lip that you can find), some oobleck (perhaps from #7?) or a tub of frosting, some foam card stock (simulating the continental plate) and two heavy flat objects (like tiles or small plates) (simulates the oceanic plates)

Step 1:  put the oobleck or the frosting into the pan
step 2: place 2 heavy flat objects into the pan - on top of the goo from step 1 - 
            place them side by side.  Then, while pressing down slightly, move them apart.  The goo underneath should be exposed and will push up where the plates are separated.  This demonstrates how the magma will come to the surface when the plates are moving apart at divergent boundaries.  
In a divergent boundary the plates move apart from each other.

Step 3:  reset to the beginning
Step 4: Place one heavier plate next to a piece of lighter foam card.  Gently push the two pieces together until they overlap so that the foam is on top of the heavier plate.  What happens?
In a convergent boundary the plates move toward one another.

Step 5: reset to the beginning
Step 6: place two pieces of light material next to each other.  Push the pieces in opposite directions perpendicular to the direction of the junction (so one north and one south, rather than toward or away from each other).  What happens?
This is a transform boundary- these move alongside each other.
   
Which type of boundary creates volcanoes?  

Which type of boundary is the San Andres fault which runs alongside California in the United States?





answers:
Volcanoes are caused by divergent boundaries
The San Andreas fault is caused by a transform boundary.

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