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Plate Tectonics The Earth’s Crust in Motion… The Theory In 1910 Alfred Wegener begins to wonder… What’s the relationship? Perhaps all these pieces used to be connected. Continental drift=slow movement over Earth’s surface 300 million years ago… Supercontinent Pangaea means all lands •Found the same type of reptile and insect fossils on different continents across oceans. •Tropical forests remains in artic areas Tens of Millions of years! Structure of the Earth’s Interior How does it work? Plates – pieces of the lithosphere Plates fit closely together along cracks called Plate Boundaries Convection Currents movement Earth’s Puzzle • What plate do we live on? • What plates do we border? • USGS Earth’s Plates • How far do we move every year? Types of Boundaries • Divergent • Convergent • Transform Your Task...Get Organized • Get into teams of three • Each person will focus on one type of boundary – divergent (Column A) – convergent (Column B) – transform (Column C) • Look only at your column • Make a concept map A Divergent •plates are moving apart •new crust is created •Magma is coming to the surface B Convergent •plates are coming together •crust is returning to the mantle C Transform •plates are slipping past each other •crust is not created or destroyed A Divergent Continental crust rift valley B Convergent 2 continental plates mountain range C Transform Plates move against each other Stress builds up Oceanic crust midocean ridge 2 oceanic plates or oceanic + continental subduction Stress is released earthquake The Big Picture Key Terms for Map convergent boundary divergent boundary transform boundary subduction rift valley mid-ocean ridge continental crust oceanic crust mountain range earthquake