GEOG 1040H Lecture 20: Lecture 20 Notes
30 Nov 2017
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Tectonics, earthquakes, and volcanism: earth"s surface relief features, crustal formation processes, crustal deformation processes, orogenesis (mountain building, earthquakes, volcanism. Earth"s surface relief features: hypsometry (fraction of area with elevation given elevation) (what portion of the earth"s surface has a given value of elevation, earth"s topographic regions, terrance: migrating pieces of the earth"s crust, moved via plate tectonics. Earth"s hyposmetry: look at picture on slideshow. Earth"s topographic regions: some mountain ranges are associated with subduction zones. Crustal formation processes: continental shields (cratons, building continental crust and terrance"s. Continental shields: largest = african shield (oldest rocks on earth, 9 different types of continental shields, 3 billion-year-old rocks, high density, doesn"t sink. Crustal formations: look at diagram on slideshow, 3 main categories: November 29th, 2017: residual mountains and continental cores from past tectonic activity. Inactive stable for past 1000 ma (cratons) Terrance: migrating pieces that merge pieces if crust that merge with. Larger continents: active tectonic features: mountains, folding and faulting.
