Caleb Plate Tectonics

By cbob

  • Continental drift

    Who proposed this theory? Alfred Wegener Why did he believe this theory?
    1. Continents were moving
    2. Rock Clues
    3. Fossil evidence
    4. Climate clues
    Why did others not believe his theory? How could continents possibly move

  • Seafloor spreading

    Who proposed this theory? Harry Hess What does this theory state? The ocean crust is made up of rocks moving away from each other. When this happens magma flows up in between them to create new crust. Why did he believe this theory?
    1. Molten Material
    2. Seafloor drill
    3.Fossil Clues
    1. Magnetic Cluess

  • Plate Tectonics

    Theory proposed:
    Plate tectonics What does this theory state?
    is the theory that the earth's outer shell is made up of many parts that glide over the mantle. Why was this theory created/proposed? (think critically.)
    This theory was proposed to combine continental drift and seafloor spreading to make a more complete theory.