ESS102H1 Study Guide - Archean, Sedimentary Rock, Network Layer

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13 Dec 2011
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Isostasy the concept of different thicknesses of crust riding on the mantle. Explains most of the variations in elevation from one region to another. Lecture 7: volcanoes pyroclastic flows very dangerous. Tephra is the ash like substance spewed out of a volcano. Magnitude-frequency concept large disaster is uncommon, small hazard is frequent (ex. Gis geographical information systems maps of slope, bedrock, previous landslides, and airphoto. Lecture 8: uniformitarianism james hutton constant cycle of deposition, burial, uplift, erosion, and re- deposition. Body fossils direct evidence e. g. bones, shells. Trace fossils indirect evidence e. g. tracks, burrows, coproliths. To preserve fine fossils immediate burial, (recrystalization destroys fine structure) carbonization, petrifaction. Disconformities mark breaks or pauses in sedimentation. Unconformities marks periods of uplift and erosion. Lecture 9: ice w/in a glacier moves downhill by plastic flow. Even when glaciers are gone, we can still tell that they were present due to the evidence left behind: u-shaped valleys, ar te, and cirque.