Earth Sciences 2240F/G Lecture Notes - Lecture 3: Divergent Boundary, Mantle Plume, Great Compression
2 Mar 2018
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Alfred wegener: the first to formulate steps towards continental drift, published them in 1912. Struck by the jigsaw fit of the continents figured it was more then coincidence. 3. 0 paleomagnetism and earth"s magnetic field: any material that is magnetic and allowed to float will point north and south. Scientist are able to look at rocks by looking at igneous rocks: basalt is the most common of volcanic rocks, contains enough iron that when the magma cools they orient themselves north to south. 4. 0 sea-floor spreading: the evidence from paleomagnetism: the data collected during wwii found that there were alternating strips of normal polarity and reverse polarity. 5. 0 subduction zones: plate compression: this is where old crust is being destroyed, the ocean floors has deep trenches that mark numerous earthquakes, this is where crust is being consumed (a place of great compression) Hugo benioff: worked on development and application of instruments to accurately earthquake location, called a seismograph.
