The document discusses the continental drift theory proposed by Alfred Wegener in the early 1900s. It provides evidence that Wegener used to support his theory, including matching landforms between continents, identical fossil finds in separated continents, and plant fossils found in unexpected locations. It also discusses Harry Hess and his theory of sea floor spreading, which helped explain continental drift. Hess proposed that new material is added at mid-ocean ridges, evidenced by older rocks found farther from ridges.
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