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Earth Sciences
Charly Bank

Monday Feb 612Introductory GeologyC BanksStudy PrepTopics include everything we have covered so far in particular society resources hazards water plate tectonics locations of volcanoes and earthquakes 3 types of plate boundaries lithosphereasthenosphere versus crustmantle measuring plate velocities and what is the driving force minerals properties strength shape optical other and usesKey minerals you should know something about are gold copper diamond graphite magnetite corundum ruby sapphire pyrite galena gypsum calcite quartz feldspar mica amphibole olivine garnet For diamonds we covered kimberlite versus alluvial value fingerprinting and politics rocks source process associated landformsenvironment for igneous sedimentary and metamorphic rocks the rock cycle other testable material includes the experiments I tried in class You should also check the lecture tutorials we did during classtimeDefinitionsIsostasy The equilibrium that exists between parts of the earths crust where one are is counterbalanced by a depressed part in another Isostasy exists because the earths crust is relatively light compared to the denser mantle over which it lies and therefore behaves as if it is floating Areas of the Earths crust rise of subside to accommodate added load or diminished load so that the forces that elevate landmasses balance the force that depress themMOR Mid ocean ridgesAxial Field A postulated magnetic field for the earth consisting of a pair of equal and oppositely charged or magnetized poles separated by a distance centered at the earths center with its axis coincident with the earths rotational axisMineral a naturally occurring inorganic solid that posses an orderly internal structure and a definite chemical compositionPlate TectonicsThe Earths surface is broken into plates some large some smallPlates move 39 cm a yearThe crust on mantle is purely compositionalLithosphere and asthenosphere are the strengthContinents are on average 300m highOceans on average are 4m deep with very deep MOR of 10kmWe can see the presence of previous extinct volcanoes as they tend to grow like pearls on a string causing volcanic island chain plateausEarthquakes similarly mimic pearls on a string but do so even betterPlate BoundariesPlate is called the lithosphereBelow the plate is the asthenosphere
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