GEOL 102 Study Guide - Planetary Differentiation, Eukaryote, Calcite
Document Summary
Section 7 the early earth (review chapter 11) Earliest stage of the earth (4. 56 billion years ago) Multiple different heat sources: heat of friction upon impact, gravitational compression, radiogenic decay of isotopes. All these heat sources melted the early earth. The mobility of elements based on their mass: gravity and cooling acting upon things. Heaviest elements such as fe, ni get pulled down to the center of the earth and form a proto-core. Lighter elements such as c, o, si move to the surface. Similar to today with h2, n2, and co2, but also had methane and no oxygen. Formed from de-gassing of the mantle that happened during plate tectonics. Diffusion of atmospheric water and chemical alteration of crustal rocks. Explain the process, product, importance, and any unresolved issues regarding. They created a mini-world that was totally contained with water and an atmosphere of carbon dioxide, methane, nitrogen, and no oxygen.
