GL101- Midterm Exam Guide - Comprehensive Notes for the exam ( 15 pages long!)

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5 Oct 2017
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Historical notes: catastrophism- earth"s landscapes were formed by sudden disasters. The doctrine of catastrophism in uenced people"s thinking about the earth: uniformitarianism- the present is the key to the past . This information comes from outcrops where bedrock is exposed at the surface. Geology, people, and the environment: natural hazards are part of living on earth, hazards are simple natural processes, but they become hazards only when people try to live where these processes occur. Relative dating and geological time: relative dating means that events are placed in proper sequence without knowing their age in years or over older rock layers, law of superposition- younger rock layers are deposited over older rock layers. Plate tectonics: a geological paradigm: continental drift- alfred wegener (1915) proposed continents moved on earth"s surface, plate tectonics- current understanding of how continents move. Plate tectonics: lithosphere broken up into 7 major plates, plates move very slowly, convection in mantle, averages about 5cm/year.

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