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  • 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.