Tonight, we take another journey into a relaxing science classic, Principles of Geology. Let's erode away our stress, take a sleepy stroll through the halls of geological history, and ponder some rather odd theories about the formation of the land beneath our feet.

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Read "Principles of Geology" at Project Gutenberg: http://www.gutenberg.org/ebooks/33224

Music: "earth 2 earth," by PCIII, is licensed under CC

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