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In 1962, Harry Hess at Princeton University hypothesized that the topography of the seafloor could be explained if the seafloor were moving sideways away from the oceanic ridge. This came to be called the Hess hypothesis of:

Seafloor Spreading

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A limestone cave that is open to the sky or whose roof has collapsed is now called a:	Which will most likely form when a steep mountain stream flows abruptly onto a flat plain: