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  • Protect Our Winters

    Protect Our Winters

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    (1 min 57 sec) A grassroots effort by winter sports professionals aims to convince the government to take action on climate change.

  • Isostasy is Key to Understanding Continental Drift

    Isostasy is Key to Understanding Continental Drift

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    (50 sec) The concept that continents float on a pliable mantle is an important element of the theory of continental drift.

  • The Principle of Isostasy

    The Principle of Isostasy

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    (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.

  • Stratigraphic Principles

    Stratigraphic Principles

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    (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

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    (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.