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  • Discovering the Wallace Line

    Discovering the Wallace Line

    Activity

    This activity supports the HHMI short film The Origin of Species: The Making of a Theory. Students are presented with a map of the Malay Archipelago and some field notebooks with observations of animals. By plotting which animals are found on which island, the students discover the Wallace Line—a sharp boundary that separates distinct Asian and Australian fauna. 

  • EarthViewer Data Files

    EarthViewer Data Files

    Activity

    Summaries and links to the data files used to create the charts in EarthViewer, including the APK file to manually install the app.

  • Holmes' Model of Convection

    Holmes' Model of Convection

    Animation

    (45 sec) An early continental drift model proposed that mantle convection can produce continental movement and new plate formation.

  • Daly's Model of Subduction

    Daly's Model of Subduction

    Animation

    (2 min 19 sec) An early model of continental drift proposed that parts of continental plates can sink into the mantle, allowing for movement.

  • The Principle of Isostasy

    The Principle of Isostasy

    Clip

    (2 min 39 sec) Continents rose in elevation after ice sheets from the last ice age retreated. This suggested that the underlying mantle is pliable.

  • Earth's Climate: Back to the Future

    Earth's Climate: Back to the Future

    Lecture

    (1 hr 27 min 59 sec) Earth has been both cooler and warmer in the past, but the change is usually gradual. The current rate of carbon dioxide increase is unprecedented in human history, and solutions to mitigate its effect on global warming are challenging to implement.

  • Changing Planet: Past, Present, Future

    Changing Planet: Past, Present, Future

    Lecture

    Has Earth changed over deep time? How did Earth shape life and life shape Earth? What does Earth's climate in the distant past tell us about the future?

  • Stratigraphic Principles

    Stratigraphic Principles

    Clip

    (2 min 21 sec) Dr. John Shea demonstrates the two main principles in the study of rock layers: superposition and association.