e7.pdf - EPSC 201 FINAL EXAMINATION Preparation Part 1 Multiple Choices(60 questions each 0.5 points total 30 marks Part 2 Short Answers(Best 10 out of

e7.pdf - EPSC 201 FINAL EXAMINATION Preparation Part 1...

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EPSC 201 FINAL EXAMINATION Preparation Part 1: Multiple Choices (60 questions, each 0.5 points total 30 marks) Part 2: Short Answers (Best 10 out of 16 questionnaires total 30 marks) Topics: ■ Paleomagnetism and geomagnetic pole paths The Juan de Fuca ridge and plate Age of oceanic crustal rocks Metamorphism from a mudstone Marble Causes of mass extinctions ■ Global temperature variation through geological time Megathrust earthquakes Metasomatism and neocrystallization ■ Outwash style of rivers and streams Chert Styles of volcanic edifices ■ The Hawaiian Island chain ■ Atmospheric CO 2 since industrialization The Greenland and Antarctic ice sheets ■ James Lovelock's Gaïa hypothesis The Juan de fuca ridge and plate The Juan de Fuca Ridge is a tectonic spreading center located off the coasts of the state of Washington in the United States and the province of British Columbia in Canada . It runs northward from a transform boundary, the Blanco Fracture Zone , to a triple junction with the Nootka Fault and the Sovanco Fracture Zone . To its east is the Juan de Fuca Plate , which together with the Gorda Plate to its south and the Explorer Plate to its north, is what remains of the once-vast Farallon Plate which has been largely subducted under the North American Plate . To its west is the Pacific Plate . The Juan de Fuca Ridge is a remnant of the former Pacific–Farallon Ridge . Age of oceanic crustal rocks (Ch.2) Oceanic crust spreads away from the ridge axis. - New crust is closer to the ridge; older crust farther away. - Oldest oceanic crust is found at the far edge of the basin. - In the oceanic lithosphere map, Red represents youngest and Blue oldest.
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- The oldest large scale oceanic crust is in the west Pacific and north-west Atlantic - both are about up to 180-200 million years old. However, parts of the eastern Mediterranean Sea are remnants of the much older Tethys ocean , at about 270 million years old.
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