MAST200 Lecture Notes - Lecture 3: Bruce C. Heezen, Seafloor Spreading, Marie Tharp

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Oceans, continents formed early in earth"s history. Initial placement of oceans, continents different from present. 1890 (edward suess) based on locations of common fossils, deduced that all continents. 19th century - world maps are more accurate, oceanographic expeditions provide better were once joined - gondwana bathymetric information. Alfred wegener (1880 - 1930) credited with plate tectonics; german meteorologist, concluded that continents move over long periods of time from observations of earth"s features. Present distribution of fossils could be caused by a split of a larger landmass > Ancient coral beds, continuity of rock structures, glacial deposits, mountains with identical rocks and structures, polar distribution. In 1912, proposed that continents broke apart from a larger land mass in the. Mid-atlantic ridge zone in which the floor of the atlantic, as it keeps spreading, continues tearing open and making space for fresh, relatively fluid, hot magma. Force, tidal drag from the sun, moon.

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