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  • Plate Tectonics

    Plate Tectonics

    Animation

    (1 min 16 sec) Plate tectonics is the unifying theory of Earth science.

  • 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 Evolution—The Intersection of Geology and Biology

    Earth Evolution—The Intersection of Geology and Biology

    Poster

    A poster from the 2012 Holiday Lectures on Science, Changing Planet: Past, Present, Future. It illustrates how the Earth has evolved over the past 4.6 billion years, and highlights how that evolution influences biological evolution.

  • Distribution of Elements in Earth’s Crust

    Distribution of Elements in Earth’s Crust

    Activity

    A lesson in which students read a passage and answer questions about the information presented, testing their non-fiction reading comprehension.

  • 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.

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