GLY 2038 Lecture Notes - Lecture 2: Cyanobacteria, Absolute Time And Space, Marine Biology
Document Summary
Solid earth (e) w/ deep mobile portions -> tectonic plate movement. Constant energy transfers -> build mountains, ocean basins, cause hazards. 2 types: oceanic (5-8km thick, basalt), continental (30-40km thick, granite) + mantle: 67. 1% e mass, relatively homogenous, mostly mg, si, o, fe; Mohorovicic discontinuity: marked boundaries btw crust & mantle. Lithosphere: brittle, tectonic plates, upper most level of mantle. Lower mantle: 2900km-660km depth, density & seismic wave velocity downward, minerals denser, higher pressure; + outer core: liquid (lower pressure, to high, pass fe melting pt; drastically slow down fast seismic wave, other waves can"t pass), denser elements: fe, ni; 10% lighter elements: o, s; 30. 8% e mass. + inner core: solid (high pressure), denser elements: fe, ni, 1. 7% e mass. + 4. 5 bil yrs ago, immense clouds of gas + interstellar debris (nebula) began to collapse under its own gravity. + denser & hotter center of solar sys -> sun.
