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2/10/17 MOTION OF THE LITHOSPHERE Objective: I will diagram the driving mechanism for lithospheric motion, convection within the mantle. Page 59 Mantle Convection • Convection- movement of heated material due to differences in density • caused by differences in temperatures • Scientists believe the movement of the lithosphere is due to convection in the mantle (asthenosphere) Mantle Convection Mantle Convection • Heat from the core transfers to the mantle • Within the asthenosphere: • As hot (less dense) material rises, cooler (more dense) material flows away and sinks into the mantle to replace the rising material • As the material moves, it drags the overlying lithosphere along with it Mantle Convection Ridge Push Ridge Push • Seafloor spreading is driven by convection in the asthenosphere • This exerts a force on the lithosphere called ridge push Ridge Push Slab Pull Slab Pull • As oceanic crust moves away from the ridge, it becomes more dense • When it comes in contact with less dense continental crust, the oceanic crust is pulled under • this process is called subduction • A force is exerted, called slab pull, that drags the rest of the lithosphere • Ridge push and slab pull work together to move the lithosphere Slab Pull Animation Output Activity (page 58) • Using Figure 6 from textbook Page 252 • Diagram convection within the mantle • Label all parts of the process • Identify where ridge push and slab pull occur • Make the diagram big and detailed