EVSC 1010 Lecture Notes - Lecture 5: Plate Tectonics, Marine Habitats, Geologic Time Scale
15 Aug 2016
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Intrusive: made of big crystals (indicate slow cooling); solidify inside earth granite. Extrusive: small/no crystals (rapid cooling); solidify @ earth"s surface basalt. Earth layers- solid inner core lq inner core mantle asthenosphere lithosphere crust. Gradualism/uniformitarianism: geological change occurs over long periods of time, series of almost imperceptible events. Catastrophism: geologic change sometimes occurs rapidly (thru catastrophes) modifying path of slow change. Alfred wegener- noted that african & s. amer coastlines fit together like puzzle pieces & noticed they share similar geology along coastlines (ex. fossils) Pangea: 1 super continent existed 300 million years ago. Theory of continental drift (1915) (wasn"t well received)= continents move/drift over time. Mid-oceanic ridge system: largest mountain chain on earth (after ww2 ocean topography mapping) Normal polarity- normal condition; north magnetic pole located near earth"s north pole. Reverse polarity- periods when north magnetic pole located near earth"s south pole. Sea floor spreading- position of earth"s magnetic field changes over geologic time; constantly moving.
