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  • Plate Tectonics

    Plate Tectonics

    Animations

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

  • The Principle of Isostasy

    The Principle of Isostasy

    Clips

    (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.

  • Distribution of Elements in Earth’s Crust

    Distribution of Elements in Earth’s Crust

    Lessons

    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

    Clips

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