GEOL 1340 Chapter Notes - Chapter 10: Craton, Lidar, Subduction
8 Nov 2016
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Topography: undulations and other variations in shape of surface. Use satellite radar to study relief and topography. Continental landmasses: crust above or near sea level. Continental rises and slopes, flat plans (abyssal), mid-ocean ridges, submarine canyons, oceanic trenches (subduction zones) Earth"s topographic regions mountains, depressions: crustal formation. Measure of land elevation relative to sea level. 6 types: plains, high tablelands, hills, low tablelands, mountains, wide spaced. Tectonic mountains by folding, faulting, and crustal movements. Volcanic by accumulation of motel rock from eruptions. Large region where craton exposed at surface. Building continental crust and accretion of terranes. Magma wells up along mid ocean ridges and causes center to spread. Spreading causes to collide with crust along edges so denser crust goes underneath lighter crust where melts again. Terranes: varies crustal pieces that attach to plates: crustal deformation. Hinge: horizontal line defines part of fold with sharpest curvature. If axial plane goes down is overturned anticline.
