In close examination of a globe often results in the observation that most of the continents seem to fit together like a puzzle. In 1912 Alfred Wegener (notable for his theory of continental drift) noticed the same thing and proposed that the continents were once compressed into a single proto - continent which he called Pangaea (meaning "all lands"), and over time they have drifted apart into their current distribution. Wegener's hypothesis lacked a geological mechanism to explain how the continents could drift across the Earth’s surface as he proposed. He analyzed either side of the Atlantic Ocean for rock type, geological structures, and fossils. He noticed that there was a significant similarity. In 1915, Wegener published the theory that there had once been a giant continent and drew together evidence from various fields. Expanded editions during the 1920s presented the accumulating evidence. The last edition, just before his sudden death, revealed the significant observation that shallower oceans were geologically
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