GEOL 001 Lecture Notes - Lecture 3: Continental Crust, Geomagnetic Reversal, Seafloor Spreading
20 Dec 2020
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Document Summary
Evidence used in support of continental drift hypothesis: Alligator fossils were found in rocks of the same age in south america and africa. Existence of continental glaciers on the bottoms of the. Polar wandering paths for eurasia and north america. No one believed the man who first came up with this theory because he couldn"t explain why the continents have drifted apart. This was not proven true until scientists figured out how to determine where the magnetic north pole was. During the 1950s and 1960s, technological strides permitted extensive mapping of the ocean floor. The seafloor spreading hypothesis was proposed by harry hess in the early. He concluded that the seafloor was spreading away from the large mountain ranges. Known as the lithosphere: consists of uppermost mantle and overlying. Overlies a weaker region in the mantle called the asthenosphere. Plates move relative to each other at a very slow but continuous rate. About 5 centimeters (2 inches) per year.
