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Unformatted text preview: STUDY GUIDE FOR MIDTERM I FALL 2009 PROF. SAMMIS Not guaranteed to be completely complete. Use only as directed. If fever, diarrhea, or vomiting occurs, or if your anxiety lasts more than four hours - see your doctor! Time in the Earth Sciences Relative vs Absolute Time Half-life of an unstable isotope Age of the Earth how determined? Age of rocks which isotopes and why? Oldest continental rocks - where and how old? Oldest oceanic rocks where and how old? Oldest Fossils how old? Power of ten notation Ages of sun and other planets? how was the solar system formed? Age of universe? how determined? What is an earthquake? Fault plane Fault trace Fault scarp Hypocenter (focus) Epicenter Where do earthquakes occur and why? Plate boundaries divergent = mid-ocean ridges convergent = trench/island-arc structures transform = fracture zones linking sections of mid-ocean ridges. Plate tectonics = continental drift + sea floor spreading 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? The Evidence for Continental Drift Wegeners evidence for continental drift Fit of continents 300 million year old southern ice sheet 250 million year old deserts migration of species from paleontological record. Modern Evidence for continental drift Computer fit of continents how different from Wegeners data? Earths magnetic field Dipole field Inclination i and declination Remnant magnetization....
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This note was uploaded on 01/11/2010 for the course GEOL 240Lxg at USC.