PALEO200 Lecture Notes - Lecture 10: Outer Core, Termite, Theropoda
5 Apr 2016
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1912 theory of why similarities in continental coastlines existed: alfred wegener. Noticed that fossils in africa and south america shared similarities. Prevailing theory to explain this distribution of fossils. Land bridges submerged just below the sea level. Took a different approach and thought that continents themselves could have been the ones that moved: plate tectonics. New ideas: how new oceanic ridges can be produced at active volcanic rifts where two plates move away from one another. Idea of deep trenches where one plate is sub ducted beneath the other o. With evidence, the idea that earth does move came to exist. Moved about a few meters over the last century o. Earth can be compared to an avocado, comprised of several different layers. Although the outermost layer of earth is made of hard rock, the consistency and composition changes as you move deeper and deeper (molten rock) Crust: outermost thin layer made of hard rock that surrounds the earth (5-
