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German geophysicist Alfred Wegener presented his theory of continental drift, the precursor of plate tectonics, to the German Geological Society.
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Alfred Wegener
German climatologist and geophysicist (1880–1930)
Alfred Lothar Wegener was a German climatologist, geologist, geophysicist, meteorologist, and polar researcher.Source: Wikipedia (CC BY-SA)
Continental drift
Movement of Earth's continents relative to each other
Continental drift is a highly supported scientific theory, originating in the early 20th century, that Earth's continents move or drift relative to each other over geologic time. The theory of continental drift has since been validated and incorporated into the science of plate…Source: Wikipedia (CC BY-SA)
Plate tectonics
Movement of Earth's lithosphere
Plate tectonics is the scientific theory that Earth's lithosphere comprises a number of large tectonic plates, which have been slowly moving since 3–4 billion years ago. The model builds on the concept of continental drift, an idea developed during the first decades of the 20th…Source: Wikipedia (CC BY-SA)