CEE 1030 1st Edition Lecture 14 Mapping the Ocean floor We know more about the surgace of Mars and Venus than we do about the ocean floor 5 of cean floor has been mapped in detail SONAR Sound Navigation and Ranging Multibeam sonar map bathymetry over a 10 20 km swath to 1 m slow Satellite gravity 1990s seamounts 1000 m high Passive continental margin oceanic crust and continental crust part of same tectonic plate no volcanoes rare earthquakes continental shel 0 5o continental slope 5o no volcanoes but can occasionally get earthquakes Active continental margin oceanic crust and continental crust part of different tectonic plates lots of volcanoes and earthquakes marked by deep ocean trench 7 11 km deep challenger deep near Guam 10 912 m first vised by Don Walsh and Jacques Piccard in 1960 Continental shields shields stable interior of continent composed of ancient crystalline basement rocks igneous and metamorphic low elevation and relatively flat Continental platforms Platforms shield areas covered by relatively horizontal undeformed sedimentary rocks 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 Domes and Basins broad gentle warping of sedimentary strata domes anticline basin synclinal structure Mountain building Oregeny or orogenesis processes that collectively produce a mountain belt folding faulting magmatism and metamorphism Most mountain building occurs at convergent plate boundaries continent continent
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