9/21/11LEQ: How do plate boundaries change theshape of our earth? (complete sentences!)1. What do you think the word “boundary” means?(write a definition in your own words!)2. What do we call the giant slabs of lithosphere thatcover the surface of our earth?3. How is a tectonic plate similar to a dinner plate?4. Make a list of everything you know aboutearthquakes and volcanoes!! (bullets are fine!)
ACTIVATING STRATEGY• Discovery Ed: earthquake footage How do earthquakes and volcanoes change the shape of our earth?
Today’s LEQ: How do plate boundaries change the shape of our earth?By the end of today, you should be able to…1. Name the 4 types of plate boundaries2. Describe how the 4 types of boundaries move3. Explain the geologic changes that each boundary creates
GROUP READING: WRITE THE______BOUNDARIES NAME OF THE PLATE1. BOUNDARY2. YOU ARE READING3. HERE!
BECOME AN EXPERT!a) Read the text aloud as a group.b) After your group finishes reading, answer thefollowing questions TOGETHER in your notebook1. What happens to the tectonic plates at your plate boundary?2. What are the EFFECTS of your plate boundary?3. What is an EXAMPLE of the plate boundary you read about?
SHARE YOUR KNOWLEDGE!!TEACH your new group about the article you read! **Use your answers to questions 1-3 to help you! You are the only person in your group who knows anything about your specific type of boundary. YOU ARE THE EXPERT!! HELP YOUR CLASSMATES LEARN!!**
TECTONIC PLATE BOUNDARIES Leave space here!1.2. Draw this3. in your notebook!4.
Make this Chart!! TECTONIC PLATE BOUNDARIESBOUNDARY MEMORY PICTURE EFFECTS NAME TRICK
What Did You Learn?• Check and correct your notes as I quickly review them• Be ready for me to call on you!
Divergent Boundary• PICTURE: move away from each other• Effects:• -magma from mantle cools to create new crust• -continents pull apart or the ocean floor spreads• DIVERGENT boundaries DIVIDE
Convergent Boundary• PICTURE: two plates moving towards each other• EFFECTS: crust is pushed together and destroyed• -continents smash together• -mountains are formed• -CONVERGENT boundaries COLLIDE
Transform Boundary• PICTURE: two plates sliding past each other• Effect:• -plates scrape against each other• -crust isn’t created or destroyed• earthquakes happen• MEMORY TRICK: -DJ TRANSFORM!
Subduction Boundary• PICTURE: two plates are moving towards each other, the denser oceanic crust sinks under continental crust• EFFECTS:• -oceanic crust and continental crust collide• -more dense oceanic crust sinks under less dense continental crust• Subduction boundaries, oceanic plates Sink
NAME THAT BOUNDARY! PLATE BOUNDARY HAND MOTIONS
HOT Q!!!SUBDUCTION is a special type of one of the other three boundaries.What type of boundary is it?? CONVERGENT!!!
PLATE BOUNDARY IDENTIFICATION:HOLD UP THE TYPE OF BOUNDARY YOU SEE!
HOT Q: The process of subduction tells us something about the density of oceanic crust compared to continental crust. What can we say about to compare the density of the two?
SUMMARIZER:1. In your notebook draw a picture of all four types of plate boundaries2. Label each one3. Write 1 EFFECT of each type of boundary (you may use bullets—this does not need to be in complete sentences!)