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homework5_ans

homework5_ans - SIO 10 Winter 2009 Homework#5 Due Friday...

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SIO 10, Winter 2009 Homework #5 Due: Friday February 13 Lectures 13, 14, 15 (Chapters 11, 12 Interludes D, E) 20 points Write your answers on a separate sheet of paper with your name and student ID on it. Short, concise answers are preferred above lengthy ones. Note that your handwriting must be legible to receive credit. Be sure to answer all sub-questions. 1. How did seismologists discover that the outer core is liquid and the inner core is solid? (2pts) S-waves arrivals are not observed in seismograms of stations located between 103 to 180° from an earthquake hypocenter. This implies that S-waves can’t travel through the outer core at all. Since S-waves (shear waves) cannot travel through liquids, the implication is that the outer core is completely liquid. P-waves reflect off a boundary within the core, so there must be an inner, solid part of the core (page 356). 2. a) What is the difference between brittle and ductile deformation?
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