Plate Tectonics Theory

Timeline created by thesciencegroup
  • Abraham Ortelius

    Abraham Ortelius
    Came with the continental drift theory. His evidence: The Americas, Eurasia, and Africa fit together like a jig-saw puzzle.
  • Nicolaus Steno

    Nicolaus Steno
    The Law if Superposition: each layer of rock is older than the layer above it.
  • James Hutton

    James Hutton
    Used Steno’s Law of Superposition. It compares rock layers to rocks above and below the rock.
    Evidence: Hutton found granite penetrating metaphoric schists, in a way which indicated that the granite had been molten at the time. This showed to him that granite formed from cooling of molten rock, not precipitation out of water as others at the time believed, and that the granite must be younger than the schists.
  • Alfred Wegener

    Alfred Wegener
    1912: The Continental Drift Theory
    Evidence: Browsing the university library he came across a scientific paper that listed fossils of identical plants and animals found on opposite sides of the Atlantic. Intrigued by this information, Wegener began to look for, and find, more cases of similar organisms separated by great oceans. The continents fit together like a jig-saw puzzle.
  • Arthur Holmes

    Arthur Holmes
    Mantle goes under thermal convection. As magma is heated it tends to rise and then it cools and sinks again. At the time it received very little attention.
  • Harry Hess

    Harry Hess
    Sea Floor Spreading Theory
    Evidence: 1962. This led to his discovery of submerged and curiously flat-topped mountains that he named “guyots”. It also produced thousands of miles of echo-sounding surveys of the ocean floor.
  • Dan McKenzie

    Dan McKenzie
    The Theory of Plate Tectonics
    Evidence: He had a mathematical equation to back it up.