GEOL 102 1st Edition Lecture 8Outline of Last Lecture I. Continuum of ocean lithosphereII. Continental lithosphereIII. IsostacyIV. Why are ocean basins present?V. Understanding shapes of the oceans and ocean floorsOutline of Current Lecture VI. Continental drift VII. Sea floor spreadingXI. Volcanic hotspot Current LectureVI. Continental driftA. Thrown out of the scientific community in the 1920’sa. Continents are huge, so how would they be moved and not destroyed?VII. Sea Floor SpreadingA. 1960’s modified the theory and came up with sea floor spreadinga. More data was collected i. Sonar data mapped ocean floors1. Mid-oceanic ridges 2. Trenches3. Linear island changes 4. Gashes on ocean floorii. Earthquake dataThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.1. Concentrated in the ocean2. Where there were trenches, there were earthquakes B. Sea floor spreading hypothesisa. Oceanic lithosphere created at mid oceanic ridges b. Oceanic lithosphere is destroyed in the trenchesXII. Volcanic hotspota. In some parts of asthenosphere, rock melts to liquid rock – which lowers density, which leads to it rising (because low dense things float higher than denser things) b. As the lithosphere moves, volcanoes move and become extinct since the liquid rock is not moving with itc. New volcano forms under hotspot and repeats coursed. Chain of volcanoes, which only one should be active, age should increase as going further from the active
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