MI_study-sheet_2008

MI_study-sheet_2008 - OUTLINE FOR MIDTERM I Lecture 1...

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OUTLINE FOR MIDTERM I SPRING 2008 PROF. SAMMIS Lecture 1 Radioactive isotope Half life Age of the Earth – how determined Age of rocks – which isotopes and why? Oldest continental rocks (where) Oldest oceanic rocks Power of ten notation Ages of sun and other planets. Age of universe – how determined? Lecture 2 What is an earthquake? Fault plane Fault trace Fault scarp Hypocenter (focus) Epicenter Where earthquakes occur 3 types of plate boundary divergent = mid-ocean ridges convergent = trench/island-arc structures transform = fracture zones linking sections of mid-ocean ridges. Plate tectonics Lithospere (difference between lithosphere and crust) Aesthenosphere Mantle Convection Hot spots Continental Collisions Nature of seismicity at each type of plate boundary. Where do deep-focus earthquakes occur – how deep? Lecture 3 Wegener’s evidence for plate tectonics Fit of continents 300 million year old southern ice sheet 250 million year old deserts migration of species from paleontological record. Modern Evidence Computer fit of continents – how different from Wegener’s data?
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Earth’s magnetic field
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