CEE 1030 1st Edition Lecture 14Mapping 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 1960Continental 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 -
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