MSCI 210 Lecture Notes - Lecture 4: Oceanic Crust, Seismic Wave, Paleomagnetism
Document Summary
Important people: benjamin franklin & timothy folger, 1769, matthew f. maury (us navy) 1847, developed first wind and current charts for the north atlantic first to recognize. First chart of the gulf stream global pattern of wind and ocean currents considered to be the first true oceanographer - father of physical oceanography. Earth structure and plate tectonics: earth is composed of layers. Large regions of continents held up by isostatic equilibrium (buoyancy) Learn of these layers by seismic activity. Plate tectonic theory suggests that earth"s surface divided by lithospheric plates: plate tectonics explains large scale features of earth"s surface, why plates move. Gravity: 1620- sir frances bacon noted similarity of continents, a. l wegener introduced concept of plate tectonics. Didn"t know of a mechanism to move landforms. Early-mid 1900s: tech revolution in science, seismographs. Seismic waves bend as they encounter different densities of rock. B: density of earth increased evenly with depth. Center of earth is hot and molten.
