GEOS 212 1st Edition Lecture 1 Outline of Last Lecture N A Outline of Current Lecture 1 Course logistics Introductions Course web page link from D2L Course organization and grading policy Extra credit opportunities 2 Ocean Basins Basics of oceans solid earth and atmosphere Present day ocean basin characteristics Ocean basins thru geologic time plate tectonics Plate tectonics on a short time scale Geologic Time Current Lecture The surface if our globe is 70 ocean Most oceans are roughly 3 miles deep 5km with the exception of continental shelves area submerged in water around continent This means that all that volume of ocean is available for life though a lot is found in continental shelves As a result of all this area available for life 99 of all livable earth space is found in the ocean Compare all the volume of the ocean to the mere few hundred meters above and below land that is inhabited by life Know this figure In particular know that the Atenoshpere red is NOT molten It is weak and it flows allowing tectonic plates which are very strong to slide of it Think of slippery silly puddy These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Subduction zone collision between two of Earth s tectonic plates where one plate sinks into the mantle underneath the other plate Text accompanying subduction animation Tsunamis are caused when one plate subducts and the adjacent plate starts to get pulled under with it by the frictional forces holding them together Eventually the tension is too great and the second plate overcomes the friction snaps upwards and pushes the whole column of water in that portion of the ocean straight up That s a column of water roughly 600 miles deep very heavy The water then runs away on the ocean s surface in a wave traveling at 500miles hr very fast
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