10 help me 6th grade work 3.11

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Assignment: Sources of Plate Motion Exploration Introduction Recall that scientists think gravity acting on the edges of tectonic plates is a factor in their movement. These effects are called ridge push and slab pull. You can model these effects with a chair and a bed. Ridge push If you sit on a chair and let gravity pull you down into a slouching position, you'll notice your legs move out away from the chair. When your upper body falls down, it pushes your legs out and away, just as the ridge of a tectonic plate falling down pushes on the other end of the plate. The other end of the plate moves out and away from the pushing part of the plate. Slab pull Lie on a bed facing down with your upper body hanging just a little over the edge. Slowly and carefully let your upper body fall toward the floor. Notice that your legs move toward the edge of the bed. How is this like slab pull? Your upper body falling down pulls your legs toward the edge of the bed like the sinking slab of a tectonic plate would pull the rest of the plate toward it. Sources of Plate Motion The motion of Earth's tectonic plates is due in part to convection, as well as to ridge push and slab pull. Convection is a motion in a fluid or plastic material caused by heating material below and cooling material above. Study this illustration. Notice how convection currents in the mantle can affect plates in the lithosphere above it. Do you see a connection between the directions of convection currents and the motion of the plates? To see the connection more clearly, trace the motion of the currents in red. Then trace the motion of the plates in green. Review the Energy of Convection lesson for help in answering these questions if needed. © K12 Inc. AV011413 Questions 1. What processes drive motion of the plates? 2. What temperature and density changes occur in convection cells of a fluid or plastic material? 3. How can the mantle flow by convection if it is a solid? 4. Describe what occurs at mid-ocean ridges. Study this map that shows the motion of the Earth's plates. © K12 Inc. AV011413 5. Find the Nazca plate and the South American plate. How are they different? Are they moving toward or away from each other? 6. List the kinds of features you might expect to see near the edges of plates, like these two plates that are coming together. 7. How is the Nazca plate moving in relation to the Pacific plate? 8. What kinds of features would you expect to see at the edges of two plates, like these that are moving apart at their boundary? 9. How are convection currents in the mantle (geosphere) and in the oceans (hydrosphere) similar? How are they different? © K12 Inc. AV011413
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