Earth's Crust 2.0 / 5 based on 1 rating ? ChemistryThe earth and its atmosphereGCSEAQA Created by: KikiCreated on: 14-04-13 09:51 Theory of Plate Tectonics - Alfred Wegener In 17th century people noticed that South America and Africa looked like they fit together. Suggestions that continents might once have been joined together but then moved apart, most believed continents were fixed in place. In 1912 Alfred Wegener proposed thoery of continental drift. He suggested that all continents were once joined as one supercontinent called Pangaea which drifted apart. Based theory on geological evidence and fossil records, but couldn't back it up with mechanism that explained how continents moved. In 1950s palaeomagnetism provided evidence supporting continental drift. In 1960s process of sea floor spreading was dicovered - provided mechanism for continental drift. continental drift theory developed further by scientists after these findings. It grew into the theory of plate tectonics. 1 of 1
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