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  • 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.

  • Rift Valleys of Africa and Plate Tectonics

    Rift Valleys of Africa and Plate Tectonics

    Clip

    (2 min 14 sec) African rift valleys were formed by the separation of tectonic plates. Water flows down to the valley floors, creating rivers and lakes.