Search Results

Showing 1-3 of 3 Resources
  • Written in Chalk

    Written in Chalk

    Image of the Week

    The world’s chalk deposits are made of fossilized remains of the shells of tiny microscopic algae.

  • 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.

  • 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.