Geology: Seafloor Spreading, Subduction, Plate Boundaries, and Orogenesis, Quizzes of Geography

Download Geology: Seafloor Spreading, Subduction, Plate Boundaries, and Orogenesis and more Quizzes Geography in PDF only on Docsity! TERM 1 Production of New Oceanic Crust DEFINITION 1 > Seafloor Spreading > Mid-Ocean Ridges > Upwelling magma > Oldest seafloor 200 m > Impermanent > Oceanic (density 3 g / cm) > Continental Crust 2.7 TERM 2 Subduction of Crust DEFINITION 2 > descending crustal areas > dense ocean crust dives beneath continental crust > subduction zones > oceanic trenches - marinas trench (largest known underwater trench) TERM 3 Types of plate boundaries DEFINITION 3 > divergent "constructional" - seafloor spreading @ mid- oceanic ridges, zones of tension, rift valley > convergent - collision zones, compression & crust loss "destructional", S. American plate > transforth: plates slide past @ right angle to mid oceanic ridges > horizontal displacement TERM 4 Earth's Surface Relief DEFINITION 4 > vertical elevation diffs. > diff b/t highest & lowest elevations in an arear > topography - undulating form of Earth's surface TERM 5 Crustal Orders of Relief DEFINITION 5 > 1st Order of Relief: continental landmasses and ocean basins > 2nd Order of Relief: continental and mountain masses, mid ocean ridges > (LOCAL) 3rd Order of Relief: individual mountains, valleys, hills TERM 6 Crustal Formation and Deformation Processes DEFINITION 6 > Driven by tectonic activity > Formation - creation > Deformation - destruction TERM 7 Crustal DEFINITION 7 due to: 1. tectonic plates 2. gravity 3. weight TERM 8 Deformation DEFINITION 8 stress: 1. tension 2. compression 3. shear TERM 9 Rocks Respond by showing strain as: DEFINITION 9 folding and broad wrapping TERM 10 Orogenesis Birth of Mountains (mountain building) DEFINITION 10 > orogeny: mountain building episode that thickens continental crust over long time periods > large scale deformation and uplift