ESS105H1 Lecture Notes - Lecture 1: Metamorphic Rock, Continental Crust, Oceanic Crust
Document Summary
There is evidence of past global climate change because we can see the change in extent of glaciers and ice sheets (related to sea levels) The lithosphere consists of the crust and upper mantle while the asthenosphere is the lower mantle: the asthenosphere is hot, weak, and mostly solid so it can flow a little bit. Some regions are higher than others because of the relative thickness of crust (e. g. thicker crust will protrude more at top and bottom: the relationship between crustal thickness and elevation is called isostasy. Isostasy if affected by both the thickness and density of the crust. Atmosphere blocks some light and uv, sun"s energy converted into ir is also blocked by atmosphere. Moreover, different environments form different materials (e. g. rocks formed in normal surface environments are sedimentary rocks) At steep mountain front: sediment is large, angular, poorly sorted = formed by breaking away from bedrock and moved downhill under influence of gravity.
