9/20/12 BR: What do you think… Will Chicago ever have a volcano? How are mountains formed? Why do earthquakes happen? Today: The Earth’s Crust & Continental.

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Presentation transcript:

9/20/12 BR: What do you think… Will Chicago ever have a volcano? How are mountains formed? Why do earthquakes happen? Today: The Earth’s Crust & Continental Drift

Continental Drift Earth’s crust is broken up into plates which float around on magma and bump into each other. Plates move at a rate of between ½ to 4 inches annually

PangaeaPangaea – Super Continent from which all continents grew

Continental Drift Continental Drift Plates come together or spread apart at plate boundries. 1.Convergence- when 2 plates come together, forming mountains 2.Subduction- when 1plate slides under the other 3.Divergence- when magma rises to the surface, creating new ocean floor- sea floor spreading 4.Transform- when 2 plates slide against each other- fault line 5.Continental rift- when a continent is pulled apart

Assignment (25 Points)- Due Thursday Using information from today draw each type of plate boundry. Make sure to label each type of boundry.