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Topic: Plate Tectonics EQ: What effects do tectonic plates have on Earth’s surface? Plate Tectonics ● Plate Tectonics is the theory that Earth’s surface slips and slides between two layers of the Earth. ● The two layers are the lithosphere and the asthenosphere. Plate Boundaries What do you notice about plate tectonics around Michigan? Divergent Boundaries ● Divergent Boundaries occur when plates move away from each other. ● There are not many places like this on Earth EXCEPT for the Mid-Atlantic Ridge (seafloor spreading) Convergent Boundaries ● The opposite of divergent, convergent boundaries are plates that move towards each other. ● When two plates move towards each other the denser plate slides underneath the other. ● In this case volcanoes can form. Convergent Boundaries ● But what if one plate is not denser than the other? ● The plates collide pushing the Earth’s crust into the sky! We call these mountains. Transform Boundaries ● ● ● Finally we have transform boundaries. Sometimes plates lock, not wanting to move anywhere. But eventually something has to give. The plates slip past each other creating huge amounts of energy, this creates earthquakes. Can you think of some places on Earth where these boundaries appear? Think About It... Create a double bubble diagram to compare and contrast divergent boundaries and convergent boundaries.