Presentation on theme: "Coach Williams Room 310B. Plate Tectonics Objectives Describe one piece of early evidence that led people to suggest the Earth’s continents my have."— Presentation transcript:
Objectives Describe one piece of early evidence that led people to suggest the Earth’s continents my have once been joined. Discuss evidence of continental drift Explain why continental drift was not accepted when it was first proposed.
Fit of continents across Atlantic Ocean Gondwanaland: southern continents
Objectives: Explain the process of convection Summarize how convection in the mantle is related to the movements of tectonic plates Compare/contrast the processes of ridge push and slab pull
Convection: movement due to temperature differences Mantle has convection currents Currents move plates Ridge push- weight of ridge pushes plate down Slab pull- weight of plate pulls plate down