The great breadths of time.

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but I was reading the Grand Canyon thread and would like to know why the layers of the earth require such great breadths of time.

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The Exploring the Grand Canyon, from the bottom up thread is still open. Why not ask your question there and see what response you get before starting a new topic?

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Usually, in a well-conducted debate, speakers are either emotionally uncommitted or can preserve sufficient detachment to maintain a coolly academic approach.-- Encylopedia Brittanica, on debate

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