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Plate Tectonic Notes! ! Layer of Earth! 1. inner core-hot, solid sphere of iron and nickel, most dense layer, and hottest layer! 2. outer core- hot, liquid layer of iron and nickel, less dense than the inner core! 3. mantle-made of rock, thickest layer, less dense than the outer core ! asthenosphere-semi solid part of the . mantle that the lithosphere floats on! 4. crust-upper layer made of rock, less dense than the mantle! oceanic crust is thinner but more dense than the continental crust! lithosphere- crust and a thin layer of the upper mantle! ! Tectonic Plates! 1. tectonic plates are the lithosphere broken into slabs (large pieces)! 2. Alfred Wegener came up with the theory of continental drift! 3. Theory of continental drift-says the continents are slowing moving because the tectonic plates are moving on the asthenosphere! 4. To support the theory of continental drift Wegener used the similar rocks and similar fossils found on different continents ! 5. Early studies of the ocean floor helped develop the theory of plate tectonics because the age of oceanic crust increases with distance from the mid-ocean ridge.! 6. Plate movement is caused by convection in the asthenosphere! 7. Plate movement can be tracked by hot spots! 8. Discovery of magnetic reversals provide more evidence that plates move away from mid-ocean ridges.! 9. transform boundary neither create nor destroy crust.! 10. continental-continental collision- might form a mountain! 11. convergent boundaries-collide! 12. divergent boundaries-spread apart! 13. transform boundaries-slip past each other! 14. subduction-one plate sinking beneath another! 15. mid-ocean ridge-under water mountain range