GEOL 1001 Chapter : Chapter 1
Document Summary
Inner planets: mercury, venus, earth, mars, rocky, terrestrial, dense iron alloy core, shell of rock, small, outer planets, gas giants (jupiter, saturn, ice giants (uranus, neptune, asteroids- chunks of rock and or metal, comets- ice with long tails. Layers of the earth 4. 57ga earth formed: planetesimal homogeneous, heat- during collision as earths pulled in debris matter squeezed into a small volume radioactive decay, high density material sinks to middle (core, fe-alloy) August 29, 2013: 91. 2% of earth made of fe, o, si, mg, rocks are mostly silicates (have something + sio2 (quartz)) Crust: crust made of silicates (low density, continental crust, average thickness of 25-35 km, made mostly of granite (low density, oceanic crust, thinner 0-7km thick, made mostly of basalt (higher density, fe + mg + sio2. Mantle: peridotite- very fe+ mg rich, denser than crust, hotter than crust, largest part of earth, everything in mantle moves very slowly, flows 15cm per year.
