GEOG 1113 Study Guide - Quiz Guide: Plagioclase, Stratovolcano, Magnesium
Document Summary
Three-layered earth (core, mantle and crust remember the egg!) 20 c/km: outermost layer, types of crust: continental and oceanic. Oceanic crust: oceanic crust has the composition of the rock type basalt, oceanic crust is covered by sediment, high heat flow characterizes the mid-ocean ridge, high density (will typically subduct at convergent plate boundaries) Continental crust: underlies continents, variety of rock types, composition of the rock type granite low density (does not subduct at convergent plate boundaries) The mantle: bounded by crust and core, makes up >80% of planet"s volume, mostly solid, but flows" convectively, mg and fe rich. Innermost part of earth: high density material, fe alloy, division into outer and inner core, outer: convection = magnetic field. Lithosphere: crust and portion of upper mantle rigid and brittle. Asthenosphere: upper mantle plastic and able to flow. 90% percent of earth is comprised of 4 elements. Iron (fe) 35: oxygen (o) 30, silicon (si) 15, magnesium (mg) 10%
